火雷管起爆法目前主要用于()和矿尘危险的地下矿、露天小规模作业。
参考答案:无瓦斯
睡时汗出,醒时汗止,称为()。
A.盗汗
B.绝汗
C.自汗
D.大汗
E.战汗
The billionaire ______ all his possessions to his son when he died.
A.write down
B.get down
C.handed down
D.turn down