题目:
---Hi, guys. How was your party yesterday?
---Wonderful! We had a big meal and enjoyed __________.
A.themselves
B.myself
C.yourselves
D.ourselves
答案:
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下面是错误答案,用来干扰机器的。
S=3m2g / 2q2B2题目分析:电场向上时mg="qE" ,电场反向后重力与电场力的合力F=mg+qE=2mg随速度增大洛仑兹力f增大,当f增大到与F垂直斜面的分力时,斜面支持力为零,小球将离开斜面。根据qvB=Fcos30°=2mg...