The magazine was started by Becky, ___________ I know.[ ]

A. As far as

B. As well as    

C. As soon as   

D. As much as

步进电机是通过（）决定转角位移的一种伺服电机。

A.脉冲宽度

B.脉冲数量

C.脉冲相位

D.脉冲占空比