起重机械使用前应经（）监督检验合格并在有效期内。
A.监理人员
B.安全员
C.检验检测机构
D.项目总工
参考答案：A
粘附卡钻的特征有（）、（）、（）。
A certificated lifeboatman assigned to command the lifeboat must（）.
A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
D.All of the above
