一段导体两端电压是4 V，在2 min内通过导体某一横截面积的电量是15 C，那么通过这段导体的电流应是___________A。
0.125
Joining the firm as a clerk, he got rapid promotion, and _____ as a manager. [ ]
A. ended up
B. dropped out
C. came back
D. started off
改变水泵转速的方法有哪些？
