【判断题】定义双导体系统的电容为任一导体上的总电荷与两导体之间的电位差之比即C=Q/U,但电容的大小与电荷量、电位差无关。
【判断题】孤立导体的电容只决定于导体自身的大小和形状,而与所带电荷和电势无关。
【判断题】孤立导体的电容只决定于导体自身的大小和形状,而与所带电荷和电势无关。
【单选题】下面导体电容大小的表述,哪种不正确?( )
【简答题】铸造零件的工艺结构有( )、( )、( )和( )。
【单选题】读第三和第四两个副标题下的文章,完成题目 (Line15-16) ...she had a feeling that she was being watched by a tall man in a dark coat. (Line22-23) ...Polly felt a rough hand brush her face ... The writer mentioned the two ...
B.
They wanted to help her.
C.
They would do something bad to her.
D.
.Polly was too nervous.