15. The news quickly spread throughout the campus _______ he won the first prize in the competition.
A. which
B. what
C. that
D. who
查看答案
Ms. Peng’s work, a meditation on the relationship between nature and man, was later shown in an art gallery and spent a month on 1________ in a mall. “It 2_______ changed me,” Ms. Peng says of the 3________. “It’s given me the 4________ to build things like that in the future.”
()的定向移动形成了电流。
A. 正电荷
B. 负电荷
C. 带电粒子
D. 静电荷
电流的国际单位制是()。
A. 毫安
B. 安培
C. 千安
D. 微安
只有数值而无( )的电压和电流是没有意义的。
A. 实际方向
B. 参考方向
C. 功率输出
D. 电荷移动