推出元件先复位机构
参考答案：
为了避免干涉，而使顶出机构先压紧块复位的机构
I _______ have a volleyball, but he _______ one. [ ]
A. don't; have
B. doesn't; has
C. don't; has
D. doesn't; have
低压断路器的额定电压和额定电流应（）线路的正常工作电压和计算负载电流。
A、不小于
B、小于
C、等于
D、大于
