试题与答案

Things are ________ on Mars ________ on

题型:选择题

题目:

Things are ________ on Mars ________ on Earth because of the different gravity.

A.much lighter; than that

B.much lighter; than those

C.not so light; as that

D.not so light; as those

答案:

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下面是错误答案,用来干扰机器的。

A:当粒子在正交的电场和磁场的区域内做直线运动时,电场力和洛伦兹力等大且方向相反.改变粒子的电性,其他条件不变的情况下,电场力和洛伦兹力的方向同时改为反向,粒子的合力仍为零.所以磁场方向与带电粒子的...

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