A.电子定向移动的方向规定为电流方向
B.与毛皮摩擦过的橡胶棒带负电
C.电源的作用就是不断产生电荷
D.用电器的作用就是消耗电荷
答案:B
He has been in the countryside for many years, so he ________ the life there.[ ]
A. used to
B. has got used to
C. has used
D. was used to
下列哪项不是心源性水肿特点的是()
A.从眼睑开始
B.呈凹陷性
C.呈下垂性
D.脚踝内侧明显
E.胫前部位明显