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{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"B\u1ea3n th\u00e2n c\u00e1c em c\u00f3 th\u1ec3 l\u00e0 ngu\u1ed3n \u00e2m v\u00e0 c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed9 to c\u1ee7a m\u1ed9t s\u1ed1 ngu\u1ed3n \u00e2m sao cho ph\u00f9 h\u1ee3p kh\u00f4ng \u1ea3nh h\u01b0\u1edfng x\u1ea5u \u0111\u1ebfn ng\u01b0\u1eddi xung quanh. Theo em vi\u1ec7c n\u00e0o sau \u0111\u00e2y n\u00ean l\u00e0m?","select":["A. N\u00f3i chuy\u1ec7n ri\u00eang trong gi\u1edd h\u1ecdc","B. Ph\u00e1t bi\u1ec3u to r\u00f5 trong gi\u1edd h\u1ecdc","C. N\u00f3i qu\u00e1 nh\u1ecf trong giao ti\u1ebfp","D. M\u1edf l\u1edbn nh\u1ea1c v\u00e0 nghe th\u01b0\u1eddng xuy\u00ean b\u1eb1ng tai nghe"],"hint":"","explain":"<span class='basic_left'>Ph\u00e1t bi\u1ec3u to r\u00f5 trong gi\u1edd h\u1ecdc s\u1ebd gi\u00fap m\u1ecdi ng\u01b0\u1eddi nghe d\u00f5 h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2251},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u00c2m do m\u1ed9t v\u1eadt ph\u00e1t ra c\u00e0ng nh\u1ecf khi:","select":["A. V\u1eadt dao \u0111\u1ed9ng c\u00e0ng ch\u1eadm","B. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u00e0ng nh\u1ecf","C. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u00e0ng nh\u1ecf","D. V\u1eadt dao \u0111\u1ed9ng c\u00e0ng nh\u1ecf"],"hint":"","explain":"<span class='basic_left'>\u00c2m do m\u1ed9t v\u1eadt ph\u00e1t ra c\u00e0ng nh\u1ecf khi bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u00e0ng nh\u1ecf.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2252},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"\u0110\u1ed9 l\u1ec7ch l\u1edbn nh\u1ea5t c\u1ee7a v\u1eadt dao \u0111\u1ed9ng so v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0:","select":["A. T\u1ed1c \u0111\u1ed9 dao \u0111\u1ed9ng","B. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng","C. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng","D. Chu k\u1ef3 dao \u0111\u1ed9ng"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 l\u1ec7ch l\u1edbn nh\u1ea5t c\u1ee7a v\u1eadt dao \u0111\u1ed9ng so v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng. <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":2253},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Khi truy\u1ec1n \u0111i xa, \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y c\u1ee7a \u00e2m \u0111\u00e3 thay \u0111\u1ed5i ?","select":["A. Bi\u00ean \u0111\u1ed9 v\u00e0 t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u1ee7a \u00e2m","B. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u1ee7a \u00e2m","C. V\u1eadn t\u1ed1c truy\u1ec1n \u00e2m","D. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a \u00e2m"],"hint":"","explain":"<span class='basic_left'>Khi truy\u1ec1n \u0111i xa, bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a \u00e2m \u0111\u00e3 thay \u0111\u1ed5i. C\u1ee5 th\u1ec3 l\u00e0 gi\u1ea3m \u0111i do g\u1eb7p l\u1ef1c c\u1ea3n c\u1ee7a m\u00f4i tr\u01b0\u1eddng, d\u1eabn \u0111\u1ebfn \u1edf c\u00e0ng xa ngu\u1ed3n \u00e2m ta c\u00e0ng nghe th\u1ea5y \u00e2m b\u00e9 h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2254},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Ng\u01b0\u1ee1ng \u0111au (l\u00e0m \u0111au nh\u1ee9c tai) c\u1ee7a con ng\u01b0\u1eddi v\u00e0o kho\u1ea3ng:","select":["A. 130dB","B. 120dB","C. 110dB","D. 100dB"],"hint":"","explain":"<span class='basic_left'>Ng\u01b0\u1ee1ng \u0111au (l\u00e0m \u0111au nh\u1ee9c tai) c\u1ee7a con ng\u01b0\u1eddi v\u00e0o kho\u1ea3ng 130dB.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2255},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a \u00e2m c\u00e0ng l\u1edbn khi:","select":["A. V\u1eadt dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 c\u00e0ng l\u1edbn","B. V\u1eadt dao \u0111\u1ed9ng c\u00e0ng nhanh","C. V\u1eadt dao \u0111\u1ed9ng c\u00e0ng ch\u1eadm","D. V\u1eadt dao \u0111\u1ed9ng c\u00e0ng m\u1ea1nh"],"hint":"","explain":"<span class='basic_left'>Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a \u00e2m c\u00e0ng l\u1edbn khi v\u1eadt dao \u0111\u1ed9ng c\u00e0ng m\u1ea1nh.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":2256},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"V\u1eadt ph\u00e1t ra \u00e2m to h\u01a1n khi n\u00e0o?","select":["A. Khi v\u1eadt dao \u0111\u1ed9ng nhanh h\u01a1n","B. Khi v\u1eadt dao \u0111\u1ed9ng m\u1ea1nh h\u01a1n","C. Khi t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng l\u1edbn h\u01a1n","D. C\u1ea3 3 tr\u01b0\u1eddng h\u1ee3p tr\u00ean"],"hint":"","explain":"<span class='basic_left'>V\u1eadt ph\u00e1t ra \u00e2m to h\u01a1n khi v\u1eadt dao \u0111\u1ed9ng m\u1ea1nh h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2257},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng l\u00e0 g\u00ec?","select":["A. L\u00e0 \u0111\u1ed9 l\u1ec7ch l\u1edbn nh\u1ea5t so v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng khi v\u1eadt dao \u0111\u1ed9ng.","B. L\u00e0 \u0111\u1ed9 l\u1ec7ch c\u1ee7a v\u1eadt trong m\u1ed9t gi\u00e2y","C. L\u00e0 kho\u1ea3ng c\u00e1ch l\u1edbn nh\u1ea5t gi\u1eefa hai v\u1ecb tr\u00ed m\u00e0 v\u1eadt dao \u0111\u1ed9ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c","D. L\u00e0 s\u1ed1 dao \u0111\u1ed9ng trong m\u1ed9t gi\u00e2y"],"hint":"","explain":"<span class='basic_left'>Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng l\u00e0 \u0111\u1ed9 l\u1ec7ch l\u1edbn nh\u1ea5t so v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng khi v\u1eadt dao \u0111\u1ed9ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2258},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"\u0110\u1ed9 to c\u1ee7a \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o sau \u0111\u00e2y?","select":["A. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng","B. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng","C. Th\u1eddi gian dao \u0111\u1ed9ng","D. T\u1ed1c \u0111\u1ed9 dao \u0111\u1ed9ng"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 to c\u1ee7a \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng. Bi\u00ean \u0111\u1ed9 c\u00e0ng l\u1edbn, \u00e2m c\u00e0ng to.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":2259},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"T\u1ea1i sao khi n\u00f3i chuy\u1ec7n trong ph\u00f2ng k\u00edn ta th\u01b0\u1eddng nghe to h\u01a1n trong ph\u00f2ng kh\u00f4ng k\u00edn?","select":["A. V\u00ec ph\u00f2ng k\u00edn n\u00ean \u00e2m kh\u00f4ng l\u1ecdt ra ngo\u00e0i \u0111\u01b0\u1ee3c do \u0111\u00f3 m\u00e0 ta nghe r\u00f5 h\u01a1n","B. V\u00ec ph\u00f2ng h\u1edf lu\u00f4n lu\u00f4n c\u00f3 s\u1ef1 \u0111\u1ed1i l\u01b0u c\u1ee7a kh\u00f4ng kh\u00ed do \u0111\u00f3 kh\u00f4ng kh\u00ed s\u1ebd mang \u00e2m \u0111i xa l\u00e0m gi\u1ea3m \u0111\u1ed9 to c\u1ee7a \u00e2m, v\u00ec v\u1eady m\u00e0 tai ta nghe kh\u00f4ng \u0111\u01b0\u1ee3c r\u00f5","C. V\u00ec ph\u00f2ng k\u00edn th\u01b0\u1eddng y\u00ean t\u0129nh h\u01a1n do \u0111\u00f3 tai ta nghe r\u00f5 h\u01a1n","D. C\u1ea3 3 c\u00e2u tr\u00ean \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>Ngo\u00e0i ra c\u00f2n do ta nghe \u0111\u01b0\u1ee3c \u00e2m ph\u1ea3n x\u1ea1 \u0111\u1ebfn \u0111\u1ed3ng th\u1eddi v\u1edbi \u00e2m ph\u00e1t ra n\u00ean ta c\u1ea3m th\u1ea5y nghe to h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2260},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Sinh nh\u1eadt n\u0103m nay b\u1ea1n Ng\u00e2n \u0111\u01b0\u1ee3c t\u1eb7ng r\u1ea5t nhi\u1ec1u chu\u00f4ng gi\u00f3 hay c\u00f2n g\u1ecdi l\u00e0 \u201cphong linh\u201d. M\u1ed7i khi c\u00f3 gi\u00f3 ti\u1ebfng chu\u00f4ng ph\u00e1t ra nh\u1eefng \u00e2m thanh r\u1ea5t vui tai. Ng\u00e2n c\u1ee9 th\u1eafc m\u1eafc m\u00e3i t\u1ea1i sao c\u00f9ng l\u00e0m t\u1eeb ch\u1ea5t li\u1ec7u nh\u00f4m c\u0169ng b\u1ecb gi\u00f3 th\u1ed5i nh\u01b0 nhau m\u00e0 m\u1ed7i chu\u00f4ng gi\u00f3 l\u1ea1i ph\u00e1t ra \u00e2m thanh th\u1eadt kh\u00e1c nhau?","select":["A. V\u00ec \u0111\u1ed9 d\u00e0i ng\u1eafn c\u1ee7a c\u00e1c thanh nh\u00f4m kh\u00e1c nhau do \u0111\u00f3 \u00e2m thanh truy\u1ec1n trong t\u1eebng \u1ed1ng nh\u00f4m kh\u00e1c nhau","B. V\u00ec c\u00e1c \u1ed1ng nh\u00f4m c\u00f3 b\u00e1n k\u00ednh kh\u00e1c nhau do \u0111\u00f3 m\u00e0 ph\u00e1t ra c\u00e1c \u00e2m kh\u00e1c nhau","C. V\u00ec c\u00e1c \u1ed1ng nh\u00f4m d\u00e0y m\u1ecfng kh\u00e1c nhau n\u00ean ph\u00e1t ra \u00e2m c\u0169ng kh\u00e1c nhau","D. C\u1ea3 ba c\u00e2u tr\u00ean \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'>\u0110\u1ed9 d\u00e0i, b\u00e1n k\u00ednh v\u00e0 \u0111\u1ed9 d\u00e0y m\u1ecfng c\u1ee7a \u1ed1ng nh\u00f4m c\u0169ng g\u00e2y thay \u0111\u1ed5i \u00e2m ph\u00e1t ra khi ch\u00fang \u0111\u01b0\u1ee3c gi\u00f3 th\u1ed5i v\u00e0 va ch\u1ea1m v\u00e0o nhau.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2261},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"T\u1ea1i sao khi \u0111\u1ee9ng t\u1ea1i s\u00e2n ga ta nghe ti\u1ebfng c\u00f2i r\u1eddi ga ph\u00e1t ra nh\u1ecf d\u1ea7n, c\u00f2n khi t\u00e0u \u0111\u1ebfn ga th\u00ec \u00e2m thanh l\u1edbn d\u1ea7n?","select":["A. V\u00ec \u0111\u00f3 l\u00e0 d\u1ea5u hi\u1ec7u \u0111\u1ec3 ph\u00e2n bi\u1ec7t t\u00e0u \u0111\u1ebfn v\u00e0 t\u00e0u \u0111i","B. V\u00ec khi t\u00e0u \u0111\u1ebfn l\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa ta v\u00e0 t\u00e0u m\u1ed7i l\u00fac m\u1ed9t g\u1ea7n do \u0111\u00f3 m\u00e0 ta nghe to h\u01a1n, c\u00f2n t\u00e0u \u0111i th\u00ec kho\u1ea3ng c\u00e1ch m\u1ed7i l\u00fac m\u1ed9t xa n\u00ean ta nghe nh\u1ecf h\u01a1n","C. C\u1ea3 hai c\u00e2u tr\u00ean \u0111\u1ec1u \u0111\u00fang","D. C\u1ea3 hai c\u00e2u tr\u00ean \u0111\u1ec1u sai"],"hint":"","explain":"<span class='basic_left'>Khi \u0111\u1ee9ng t\u1ea1i s\u00e2n ga ta nghe ti\u1ebfng c\u00f2i r\u1eddi ga ph\u00e1t ra nh\u1ecf d\u1ea7n, c\u00f2n khi t\u00e0u \u0111\u1ebfn ga th\u00ec \u00e2m thanh l\u1edbn d\u1ea7n v\u00ec khi t\u00e0u \u0111\u1ebfn l\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa ta v\u00e0 t\u00e0u m\u1ed7i l\u00fac m\u1ed9t g\u1ea7n do \u0111\u00f3 m\u00e0 ta nghe to h\u01a1n, c\u00f2n t\u00e0u \u0111i th\u00ec kho\u1ea3ng c\u00e1ch m\u1ed7i l\u00fac m\u1ed9t xa n\u00ean ta nghe nh\u1ecf h\u01a1n.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":2262},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Khi m\u00e1y thu thanh ph\u00e1t ra \u00e2m to, \u00e2m nh\u1ecf th\u00ec bi\u00ean \u0111\u1ed9 c\u1ee7a m\u00e0ng loa kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o? ","select":["A. Khi m\u00e1y thu thanh ph\u00e1t ra \u00e2m to th\u00ec bi\u00ean \u0111\u1ed9 c\u1ee7a m\u00e0ng loa l\u1edbn","B. Khi m\u00e1y thu thanh ph\u00e1t ra \u00e2m nh\u1ecf th\u00ec bi\u00ean \u0111\u1ed9 c\u1ee7a m\u00e0ng loa l\u1edbn","C. Khi m\u00e1y thu thanh ph\u00e1t ra \u00e2m l\u1edbn th\u00ec bi\u00ean \u0111\u1ed9 c\u1ee7a m\u00e0ng loa nh\u1ecf","D. C\u1ea3 B v\u00e0 C"],"hint":"","explain":"<span class='basic_left'>Khi m\u00e1y thu thanh ph\u00e1t ra \u00e2m to th\u00ec bi\u00ean \u0111\u1ed9 c\u1ee7a m\u00e0ng loa l\u1edbn v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2263},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Nh\u1eadn x\u00e9t n\u00e0o d\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u00fang?","select":["A. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u00e0ng l\u1edbn, \u00e2m ph\u00e1t ra c\u00e0ng cao (b\u1ed5ng).","B. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u00e0ng nh\u1ecf, \u00e2m ph\u00e1t ra c\u00e0ng cao (b\u1ed5ng).","C. Dao \u0111\u1ed9ng c\u00e0ng m\u1ea1nh, bi\u00ean \u0111\u1ed9 nh\u1ecf, \u00e2m ph\u00e1t ra c\u00e0ng to.","D. Dao \u0111\u1ed9ng c\u00e0ng y\u1ebfu, bi\u1ec1n \u0111\u1ed9 nh\u1ecf, \u00e2m ph\u00e1t ra c\u00e0ng to."],"hint":"","explain":"<span class='basic_left'>T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u00e0ng l\u1edbn, \u00e2m ph\u00e1t ra c\u00e0ng cao (b\u1ed5ng) v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2264},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng:<br\/>Qu\u1ea3 c\u1ea7u b\u1ea5c l\u1ec7ch c\u00e0ng (1) \u2026, ch\u1ee9ng t\u1ecf bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a m\u1eb7t c\u00e0ng (2)\u2026, ti\u1ebfng tr\u1ed1ng c\u00e0ng (3).....","select":["A. (1) - nhi\u1ec1u; (2)- l\u1edbn; (3) - to","B. (1) - nhi\u1ec1u; (2)- b\u00e9 ; (3) - to","C. (1) - \u00edt; (2) - l\u1edbn; (3) - to","D. (1) - \u00edt; (2) - b\u00e9; (3) - nh\u1ecf"],"hint":"","explain":"<span class='basic_left'>Qu\u1ea3 c\u1ea7u b\u1ea5c l\u1ec7ch c\u00e0ng nhi\u1ec1u, ch\u1ee9ng t\u1ecf bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a m\u1eb7t c\u00e0ng l\u1edbn, ti\u1ebfng tr\u1ed1ng c\u00e0ng to.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":2265},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Khi g\u1ea3y m\u1ea1nh m\u1ed9t d\u00e2y \u0111\u00e0n, ti\u1ebfng \u0111\u00e0n s\u1ebd to hay nh\u1ecf? T\u1ea1i sao?","select":["A. G\u1ea3y m\u1ea1nh d\u00e2y \u0111\u00e0n th\u00ec ti\u1ebfng \u0111\u00e0n s\u1ebd k\u00eau nh\u1ecf v\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a d\u00e2y \u0111\u00e0n l\u1edbn.","B. G\u1ea3y m\u1ea1nh d\u00e2y \u0111\u00e0n th\u00ec ti\u1ebfng \u0111\u00e0n s\u1ebd k\u00eau to v\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a d\u00e2y \u0111\u00e0n nh\u1ecf.","C. G\u1ea3y m\u1ea1nh d\u00e2y \u0111\u00e0n th\u00ec ti\u1ebfng \u0111\u00e0n s\u1ebd k\u00eau to v\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a d\u00e2y \u0111\u00e0n l\u1edbn.","D. G\u1ea3y m\u1ea1nh d\u00e2y \u0111\u00e0n th\u00ec ti\u1ebfng \u0111\u00e0n s\u1ebd k\u00eau nh\u1ecf v\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a d\u00e2y \u0111\u00e0n nh\u1ecf."],"hint":"","explain":"<span class='basic_left'>G\u1ea3y m\u1ea1nh d\u00e2y \u0111\u00e0n th\u00ec ti\u1ebfng \u0111\u00e0n s\u1ebd k\u00eau to v\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a d\u00e2y \u0111\u00e0n l\u1edbn.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":2266},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"H\u00e3y \u01b0\u1edbc l\u01b0\u1ee3ng \u0111\u1ed9 to c\u1ee7a ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i n\u1eb1m trong kho\u1ea3ng n\u00e0o?","select":["A. Ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i kho\u1ea3ng 20 dB \u0111\u1ebfn 40 dB [t\u1eeb ti\u1ebfng n\u00f3i th\u01b0\u1eddng \u0111\u1ebfn ti\u1ebfng n\u00f3i to (nh\u1ea1c to)]","B. Ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i kho\u1ea3ng 60 dB \u0111\u1ebfn 80 dB [t\u1eeb ti\u1ebfng n\u00f3i th\u01b0\u1eddng \u0111\u1ebfn ti\u1ebfng n\u00f3i to (nh\u1ea1c to)]","C. Ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i kho\u1ea3ng 50 dB 70 dB [t\u1eeb ti\u1ebfng n\u00f3i th\u01b0\u1eddng \u0111\u1ebfn ti\u1ebfng n\u00f3i to (nh\u1ea1c to)]","D. Ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i kho\u1ea3ng 40 dB \u0111\u1ebfn 60 dB [t\u1eeb ti\u1ebfng n\u00f3i th\u01b0\u1eddng \u0111\u1ebfn ti\u1ebfng n\u00f3i to (nh\u1ea1c to)]"],"hint":"","explain":"<span class='basic_left'>Ti\u1ebfng \u1ed3n tr\u00ean s\u00e2n tr\u01b0\u1eddng gi\u1edd ra ch\u01a1i kho\u1ea3ng 40 dB \u0111\u1ebfn 60 dB [t\u1eeb ti\u1ebfng n\u00f3i th\u01b0\u1eddng \u0111\u1ebfn ti\u1ebfng n\u00f3i to (nh\u1ea1c to)]<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":2267},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Khi n\u00e0o th\u00ec tai nghe \u0111\u01b0\u1ee3c \u00e2m to nh\u1ea5t?","select":["A. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai c\u00f9ng m\u1ed9t l\u00fac v\u1edbi \u00e2m ph\u1ea3n x\u1ea1.","B. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai tr\u01b0\u1edbc \u00e2m ph\u1ea3n x\u1ea1.","C. \u00c2m ph\u00e1t ra \u0111\u1ebfn tai, \u00e2m ph\u1ea3n x\u1ea1 \u0111i n\u01a1i kh\u00e1c ch\u1ee9 kh\u00f4ng truy\u1ec1n \u0111\u1ebfn tai.","D. C\u1ea3 ba tr\u01b0\u1eddng h\u1ee3p tr\u00ean"],"hint":"","explain":"<span class='basic_left'>\u00c2m ph\u00e1t ra \u0111\u1ebfn tai c\u00f9ng m\u1ed9t l\u00fac v\u1edbi \u00e2m ph\u1ea3n x\u1ea1 th\u00ec tai nghe \u0111\u01b0\u1ee3c \u00e2m to nh\u1ea5t.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2268},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o khi ph\u00e1t ra ti\u1ebfng to v\u00e0 ti\u1ebfng nh\u1ecf?","select":["A. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y d\u00e0n m\u1ea1nh, d\u00e2y l\u1ec7ch nhi\u1ec1u khi ph\u00e1t ra ti\u1ebfng to.","B. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n y\u1ebfu, d\u00e2y l\u1ec7ch \u00edt khi ph\u00e1t ra ti\u1ebfng to.","C. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y d\u00e0n y\u1ebfu, d\u00e2y l\u1ec7ch nhi\u1ec1u khi ph\u00e1t ra ti\u1ebfng to.","D. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y d\u00e0n m\u1ea1nh, d\u00e2y l\u1ec7ch nhi\u1ec1u khi ph\u00e1t ra ti\u1ebfng nh\u1ecf."],"hint":"","explain":"<span class='basic_left'>Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y d\u00e0n m\u1ea1nh, d\u00e2y l\u1ec7ch nhi\u1ec1u khi ph\u00e1t ra ti\u1ebfng to.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2269},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o khi ph\u00e1t ra \u00e2m cao v\u00e0 \u00e2m th\u1ea5p?","select":["A. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n nhanh khi ph\u00e1t ra ti\u1ebfng cao v\u00e0 ch\u1eadm khi ph\u00e1t ra ti\u1ebfng th\u1ea5p.","B. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n ch\u1eadm khi ph\u00e1t ra ti\u1ebfng cao v\u00e0 nhanh khi ph\u00e1t ra ti\u1ebfng th\u1ea5p.","C. Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n nhanh khi ph\u00e1t ra ti\u1ebfng th\u1ea5p.","D. C\u1ea3 3 c\u00e2u \u0111\u1ec1u \u0111\u00fang."],"hint":"","explain":"<span class='basic_left'>Dao \u0111\u1ed9ng c\u1ee7a c\u00e1c s\u1ee3i d\u00e2y \u0111\u00e0n nhanh khi ph\u00e1t ra ti\u1ebfng cao v\u00e0 ch\u1eadm khi ph\u00e1t ra ti\u1ebfng th\u1ea5p.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":2270}],"lesson":{"save":0,"level":2}}

Điểm của bạn.

Câu hỏi này theo dạng chọn đáp án đúng, sau khi đọc xong câu hỏi, bạn bấm vào một trong số các đáp án mà chương trình đưa ra bên dưới, sau đó bấm vào nút gửi để kiểm tra đáp án và sẵn sàng chuyển sang câu hỏi kế tiếp

Trả lời đúng trong khoảng thời gian quy định bạn sẽ được + số điểm như sau:
Trong khoảng 1 phút đầu tiên + 5 điểm
Trong khoảng 1 phút -> 2 phút + 4 điểm
Trong khoảng 2 phút -> 3 phút + 3 điểm
Trong khoảng 3 phút -> 4 phút + 2 điểm
Trong khoảng 4 phút -> 5 phút + 1 điểm

Quá 5 phút: không được cộng điểm

Tổng thời gian làm mỗi câu (không giới hạn)

Điểm của bạn.

Bấm vào đây nếu phát hiện có lỗi hoặc muốn gửi góp ý