采掘工作面风流中二氧化碳浓度超过l%时，必须停止用电钻打眼。（）
参考答案：错
当你遇到某人突然晕倒或溺水时，一定要尽快拨打的急救电话是 [ ]
A．110
B．120
C．119
D．114
A pattern according to which vessels and / or aircraft may conduct a co-ordinated search is a（）.
A.Research pattern
B.Research mode
C.Search pattern
D.Search and rescue mode
