三相鼠笼式异步电动机采用降压启动的目的是（）。
A.增大启动转矩
B.提高功率因数
C.减小启动电流
D.增大转速
参考答案：C
It’s no use arguing with him; _____ to persuade him to join us, he did not change his mind.[ ]
A. however I tried hard
B. however hard did I try
C. however hard tried I
D. however hard I tried
（）即骶结节韧带和骶棘韧带与坐骨小切迹围成的孔。
