对罪犯劳动现场的锐利工具必须（）
A.民警直接管理
B.日领日收
C.随领随收
D.犯人小组长代为保管
参考答案：A, C
It's impossible to avoid _________ in such stormy weather. [ ]
A. to be affected
B. being affected
C. having affected
D. to have been affected
安全阀的关闭压力应不低于额定工作压力的（）%。
A、70
B、80
C、90
D、95
