公司下述哪些仪器为一次性点检仪器.（）
A.耐压机
B、功率仪
C、阻值测试仪
D、毫安培表
E、卷尺
F、塞尺
参考答案：E, F
The biggest room in this building _____ used as a meeting room. [ ]
A. used to
B. is used to
C. used to be
D. is used to be
----What did you see on the large farm last Sunday?
----Oh, I saw about three ________ hens and _________ of eggs.
A．hundred; hundreds
B．hundreds; thousands
C．thousands; thousand
D．hundred; thousand
