保护地线或保护零线应采用()。
A.焊接
B.压接
C.螺栓连接
D.缠绕
E.钩挂
参考答案:A, B, C
But for their help, we _____ the program in time. [ ]
A. cannot finish
B. will not finish
C. had not finished
D. could not have finished
劳动教养的性质是( )。
A.行政管理方法
B.公安行政强制措施
C.行政措施
D.刑罚方法