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
