如图所示,B和和C是一组塔轮,即B和C半径不同,但固定在同一转动轴上,其半径之比为RB:RC=3:2,且轮的半径大小与C轮相同,它与B轮紧靠在一起,当A轮绕过其中心的竖直轴转动时,由于摩作用,B轮也随

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如图所示,B和和C是一组塔轮,即B和C半径不同,但固定在同一转动轴上,其半径之比为R_B:R_C=3:2,且轮的半径大小与C轮相同,它与B轮紧靠在一起,当A轮绕过其中心的竖直轴转动时,由于摩作用,B轮也随之无滑动地转动起来。a、b、c分别为三轮边缘的三个点,则a、b、c三点在运动过程中的( )

A：向心加速度大小之比为9:6:4

B：角速度之比为3:3:2

C：转速之比为2:3:2

D：线速度大小之比为3:2:2

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A

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B)根据句子意思，用括号中所给的单词适当形式填空。
____  ▲  (wolf) belong to the dog family, living and hunting together.
____ With the money donated, we have   ▲ (success) helped many poor young girls return to school.
____ If we always keep our worries to   ▲  (we), things will get even worse.
____ Our head teacher warned us   ▲ (not fly) kites near power lines in spring.
____ Though it seemed   ▲  (hope) to pass the exam, he still kept on trying.
____ A recent scientific report says three   ▲  (eight) of the school students suffer from sub-health(亚健康).

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