Đo tốc độ - Bài tập trung bình

Home Lớp 7 Khoa học tự nhiên 7 - Sách kết nối tri thức Bài 9: Đo tốc độBài tập trung bình

{"common":{"save":0,"post_id":"5998","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9443","post_id":"5998","mon_id":"1158739","chapter_id":"1158740","question":"Khi \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t vâ\u0323t s\u01b0\u0309 du\u0323ng \u0111ô\u0300ng hô\u0300 \u0111o th\u01a1\u0300i gian hiê\u0323n sô\u0301 du\u0300ng cô\u0309ng quang \u0111iê\u0323n thi\u0300 ta pha\u0309i chi\u0309nh \u0111ô\u0300ng hô\u0300 vê\u0300 chê\u0301 \u0111ô\u0323 na\u0300o sau \u0111ây?<\/p>","options":["A. Mode A.","B. Mode B.","C. Mode $A \\leftrightarrow B$<\/span> .","D. Mode A + B."],"correct":"3","level":"2","hint":"","answer":"Khi \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t vâ\u0323t s\u01b0\u0309 du\u0323ng \u0111ô\u0300ng hô\u0300 \u0111o th\u01a1\u0300i gian hiê\u0323n sô\u0301 du\u0300ng cô\u0309ng quang \u0111iê\u0323n thi\u0300 ta pha\u0309i chi\u0309nh \u0111ô\u0300ng hô\u0300 vê\u0300 chê\u0301 \u0111ô\u0323 Mode $A \\leftrightarrow B$<\/span> . \u0110a\u0301p a\u0301n \u0111u\u0301ng: C. Mode <\/span><\/strong>$A \\leftrightarrow B$<\/span><\/span> .<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-26 04:41:52","option_type":"math","len":0},{"id":"9444","post_id":"5998","mon_id":"1158739","chapter_id":"1158740","question":"Muô\u0301n \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t ho\u0323c sinh \u0111ang cha\u0323y trên sân tr\u01b0\u01a1\u0300ng ta nên s\u01b0\u0309 du\u0323ng nh\u01b0\u0303ng du\u0323ng cu\u0323 na\u0300o sau \u0111ây?  <\/p>","options":["A. Th\u01b0\u01a1\u0301c ke\u0309 va\u0300 \u0111ô\u0300ng hô\u0300 bâ\u0301m giây.","B. Cô\u0309ng quang \u0111iê\u0323n va\u0300 \u0111ô\u0300ng hô\u0300 \u0111o hiê\u0323n sô\u0301.","C. Th\u01b0\u01a1\u0301c dây va\u0300 \u0111ô\u0300ng hô\u0300 treo t\u01b0\u01a1\u0300ng.","D. Th\u01b0\u01a1\u0301c dây va\u0300 \u0111ô\u0300ng hô\u0300 bâ\u0301m giây."],"correct":"4","level":"2","hint":"","answer":"Muô\u0301n \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t ho\u0323c sinh \u0111ang cha\u0323y trên sân tr\u01b0\u01a1\u0300ng ta nên s\u01b0\u0309 du\u0323ng th\u01b0\u01a1\u0301c dây va\u0300 \u0111ô\u0300ng hô\u0300 bâ\u0301m giây. \u0110a\u0301p a\u0301n \u0111u\u0301ng: D. Th\u01b0\u01a1\u0301c dây va\u0300 \u0111ô\u0300ng hô\u0300 bâ\u0301m giây.<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-26 04:43:10","option_type":"txt","len":3},{"id":"9445","post_id":"5998","mon_id":"1158739","chapter_id":"1158740","question":"Khi s\u01b0\u0309 du\u0323ng \u0111ô\u0300ng hô\u0300 hiê\u0323n sô\u0301 du\u0300ng cô\u0309ng quang \u0111iê\u0323n \u0111ê\u0309 \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t vâ\u0323t ta câ\u0300n chu\u0301 y\u0301 \u0111iê\u0300u chi\u0309nh tâ\u0301m ca\u0309n quang sao cho khi no\u0301 chuyê\u0309n \u0111ô\u0323ng pha\u0309i … (1) … cô\u0309ng quang \u0111iê\u0323n. Nê\u0301u tâ\u0301m ca\u0309n quang … (2)… cô\u0309ng quang \u0111iê\u0323n thi\u0300 se\u0303 không \u0111o \u0111\u01b0\u01a1\u0323c th\u01a1\u0300i gian xe chuyê\u0309n \u0111ô\u0323ng gi\u01b0\u0303a hai cô\u0309ng quang \u0111iê\u0323n.<\/p>","options":["A. (1) không ch\u0103\u0301n, (2) ch\u0103\u0301n.","B. (1) tiê\u0301p xu\u0301c, (2) không tiê\u0301p xu\u0301c.","C. (1) ch\u0103\u0301n, (2) không ch\u0103\u0301n.","D. (1) không tiê\u0301p xu\u0301c, (2) tiê\u0301p xu\u0301c."],"correct":"3","level":"2","hint":"","answer":"Khi s\u01b0\u0309 du\u0323ng \u0111ô\u0300ng hô\u0300 hiê\u0323n sô\u0301 du\u0300ng cô\u0309ng quang \u0111iê\u0323n \u0111ê\u0309 \u0111o tô\u0301c \u0111ô\u0323 cu\u0309a mô\u0323t vâ\u0323t ta câ\u0300n chu\u0301 y\u0301 \u0111iê\u0300u chi\u0309nh tâ\u0301m ca\u0309n quang sao cho khi no\u0301 chuyê\u0309n \u0111ô\u0323ng pha\u0309i ch\u0103\u0301n<\/strong> cô\u0309ng quang \u0111iê\u0323n. Nê\u0301u tâ\u0301m ca\u0309n quang không ch\u0103\u0301n<\/strong> cô\u0309ng quang \u0111iê\u0323n thi\u0300 se\u0303 không \u0111o \u0111\u01b0\u01a1\u0323c th\u01a1\u0300i gian xe chuyê\u0309n \u0111ô\u0323ng gi\u01b0\u0303a hai cô\u0309ng quang \u0111iê\u0323n. \u0110a\u0301p a\u0301n \u0111u\u0301ng: C. (1) ch\u0103\u0301n, (2) không ch\u0103\u0301n.<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"147","test":"0","date":"2022-08-26 04:54:48","option_type":"txt","len":3}]}