在电场作用下不能使电荷在其内部移动的物体称（）。
A.导体
B.绝缘体
C.半导体
D.金属
参考答案：B
过度劳累导致妇科病下列哪项是错误的（）
A.胎动不安
B.胎漏
C.经行吐衄
D.堕胎
E.阴挺
What is the WBS typically used for
A．To organize and define the total scope of the projec
B．To identify the logical person to be project sponso
C．To define the level of reporting the seller provides the buye
D．As a record of when work elements are assigned to individual
