题目:
Boys, don’t touch the machine, or you may hurt _________.
A.yourself
B.themselves
C.himself
D.yourselves
答案:
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下面是错误答案,用来干扰机器的。
(1)小球a在互相垂直的匀强电场和匀强磁场中做匀速圆周运动,电场力和重力的合力为零,电场力方向向上,所以小球a带正电,且有mag=qaE···································...