局部通风机和工作面的电气设备必须装有风电闭锁和()。
A、漏电闭锁
B、瓦斯电闭锁
C、电气闭锁
D、机械闭锁
参考答案:B
Yue yue, 2-year-old girl who was hit ,began to slip into worse state on Tuesday night.
A.the ; /
B.the ; the
C.a ; the
D.the ; a