He has nothing to do today, _____?
[ ]
A. doesn't he
B. do he
C. does he
D. isn't he
答案:C
“文过饰非”中“文”是指()。
在设备台架上安装低压开关电器时,采用梯子登高要有专人扶持,必须采取()措施。
A.悬挂标示牌
B.安全带
C.防滑
D.限高