影响粘滑的主要因素有()、()、()、()、()。
参考答案:温度;矿物成分;岩石的孔隙度;水;压力
— What did Mike do?
— _________________[ ]
A. He did his homework.
B. She did her housework.
C. He goes to school.
参与吊装的人员,不按规定穿戴劳动防护用品,一旦发生意外,可能导致什么后果?