使用缓降器必须注意:()。
A、束紧带捆在腰间
B、不得超出极限负荷
C、束紧带放在腋下
D、锁紧安全钩
E、选择好绳索长度
参考答案:B, C, D, E
We _________ the work on time without your help. [ ]
A. hadn't had finished
B. didn't have finished
C. couldn't have finished
D. can't have finished
在Word编辑状态下,当前输入的文字显示在( )位置。
A.插入点
B.鼠标光标处
C.文件尾部
D.当前行尾部