甲乙两物体做匀速直线运动,它们通过的路程之比为3:2,所用时间之比是2:3,则速度之比为 . 答案: 解:甲、乙的路程之比:S甲:s乙=3:2,所用时间之比:t甲:t乙=2:3, 根据速度公式:v=,可知甲乙速度之比:v甲:v乙=:=: =9:4. 故答案为:9:4.
One learns a language by making mistakes and _________ them.
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A.
correct
B.
correcting
C.
corrects
D.
to correct