开挖深度为6米的一级基坑，现场进行检测的频率为（）。
A.1次/1d
B.1次/2d
C.2次/1d
D.3次/1d
参考答案：A
—Would you please quickly _____ the composition for me and see if there are any mistakes?
—Ok. I'll do it right now. [ ]
A. look for
B. look up
C. look through
D. look after
获得伦理委员会与受试者知情同意书属于
A．药品注册管理工作B．药品注册申请人C．药品注册D．药品注册申请E．药品补充申请
