【多选题】下列说法正确的是( )
A.
一接地空心导体球壳内外半径分别为 、 ,在球内距离球心 处 放置一点电荷 ,则其镜像电荷位于 。
B.
镜像法的实质是以场源的镜像代替边界面上感应电荷或感应电流的作用,从而可以将边界移除以简化计算难度。其理论依据是场的唯一性定理。
C.
应用镜像法时,镜像电荷绝对不可以出现在待研究区域内部。
D.
求解拉普拉斯方程问题,我们需要根据待解决问题的边界形状,决定所采用的坐标系。
【单选题】Topic sentence________________________________. The first is the sort of brain he is born with. Human brains. Differ considerably, some being more capable than others. But no matter how good a brain h...
A.
There are two major factors.
B.
Two major factors are considered important.
C.
Intelligence and human beings.
D.
There are two major factors that determine an individual’s intelligence.
【单选题】瓦纱利曾经提出( )是建筑、雕塑和绘画三门艺术之父。
【单选题】Several songs of the band become major hits. No matter ______ they go, they are sure to receive a warm welcome.
【单选题】包装包括内包装与外包装,外包装称为运输包装,内包装称为( )?
【判断题】No matter what major you are studying, what kind of job you will have, public speaking is a necessary skill that should be learned by everyone.