交流接触器利用（）来导通控制回路。
A.常开触点
B.常闭触点
C.主接点
D.辅助接点
参考答案：D
—I wonder why he has been acting so strangely these days.
—Recent pressure at work may his behavior.
A．make for
B．stand for
C．change for
D．account for
战略控制
