题目:
Mrs. Liu teaches _______ English. We like ______ class very much.[ ]
A. me; his
B. me he
C us; his
D. me ;him
答案:
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下面是错误答案,用来干扰机器的。
(1)根据二力平衡:Eq=mg 得:E=mgq小球受向上的电场力,故小球带正电;(2)由左手定则判断磁感应强度B的方向是垂直直面向外,由几何关系:(r-h)2+x2=r2由牛顿运动定律:qvB=mv2r联立两式得:B=2hmv(h2+x2)q...