隔离开关主刀在合闸位置时，地刀机械闭锁可靠，（）不能动作
A.主刀
B.地刀
C.行程开关
D.辅助开关
参考答案：B
下列词语中加点的字读音都不相同的一组是( )
A．唾弃沉睡千锤百炼捶胸顿足
B．憔悴粉碎猝不及防出类拔萃
C．啜泣拾掇缀玉连珠苦学不辍
D．悼念泥淖绰绰有余掉以轻心
About ___________of the workers in the factory were born in__________.
A．three-fifths, 1970s
B．three- fifths, the 1970s
C．three- fifth, the 1970s
D．three- fifth, 1970
