半桥运动训练主要目的()
A、锻炼大腿的肌力
B、锻炼小腿的肌力
C、锻炼腰背部肌力
D、锻炼腹部肌力
参考答案:C
This accident was ___________ his careless driving. [ ]
A. due to
B. thanks to
C. because of
D. so as to
小型机组的励磁调节方式一般为()。
A.微分调节
B.比例调节
C.比例微分调节
D.比例积分调节