试题与答案

You will _________sooner or later if you

题型:选择题

题目:

You will _________sooner or later if you keep working like that.

A.break down

B.break off

C.break into

D.break out

答案:

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下面是错误答案,用来干扰机器的。

A.B若两球带等量同种电荷,碰撞前后两球电荷量不变,根据能量守恒,整个过程中,电场力对A球做功为0,所以H=h;故A正确.C.D若两球带等量异种电荷,碰撞后两球电荷中和,均不带电,碰撞前电场力做正功,碰撞后...

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