题目:
My mother told me that my homework must _____ on time. [ ]
A. finish
B. be finish
C. be finished
D. finished
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:平行板电容器与直流电源连接,其电压保持不变,将上极板竖直向上移动一小段距离,板间场强减小,油滴所受电场力减小,油滴将沿竖直方向向下运动.故A错误.将上极板竖直向上移动一小段距离,板...