【单选题】在步进电动机步距角不能满足要求时,可采用( )功能来驱动步进电动机。
【单选题】Snape got to his feet and strode to the small window, ____ through the curtains at the deserted street, then closed them again with a jerk.
【简答题】在步进电动机步距角不能满足要求时,可采用 功能来驱动步进电动机。
【单选题】在步进电动机步距角不能满足要求时,可采用( )功能来驱动步进电动机。