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:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0616/befc96138545912c5356858bc99a5965.html
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...