带电作业工器具机械试验，静荷重试验：（）倍允许工作负荷下持续5min，工具无变形及损伤者为合格。
A.2；
B.2.5；
C.5
D.8
参考答案：B
At no time________the rules of the game.It was unfair to punish them. (2013·辽宁，26)
A．they actually broke
B．do they actually break
C．did they actually break
D．they had actually broken
汽轮机润滑油系统需补油时应满足那些要求？
