检修门、井道安全门及检修活板门均应向井道内开启，且应有用钥匙开启的锁。()
参考答案：错
___ the words the boy said at the meeting were true. We must not believe ____ he said. Only a few
of them are helpful to us. [ ]
A. None of; anything
B. All; nothing
C. Not all of; everything
D. Neither of ; something
《危险废物填埋污染控制标准》不适用于( )废物的处置。
A．氰化物溶液
B．放射性
C．卤化物溶剂
D．硝酸
