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【多选题】
关于洁净室内空气洁净度等级的检测,下列哪几项的表述是正确的?( )A.
测量仪表标定合格证书的有效使用期内
B.
采样点位置应按照业主要求确定
C.
采样时采样口气流速度尽可能接近室内设计气流速度
D.
采样量很大时,可采用顺序采样法
E.
每个采样点的最小采样时间为1min
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【单选题】听力原文：F: Here's some coffee. M: Oh, fantastic. Well, is there any sugar? What does the man want?
A.
Ice cream.
B.
Sugar.
C.
Wine.
【单选题】听力原文：W: It is said that there are some check authorization systems currently in use. M: But they are cumbersome relative to the computerized credit card validation systems. Q: What does the man think ...
A.
They are convenient.
B.
They are advanced in technology.
C.
They are cumbersome.
D.
They are computerized.
【多选题】假定市场上某种商品最多的成交价格为每公斤4.60元,则每公斤4.60元( )。
A.
可用来代表这种商品的一般价格水平
B.
是平均指标
C.
是中位数
D.
是众数
E.
是调和平均数
【单选题】听力原文：M: Right, class begins. There are some changes to your exam timetable. Your math exam will be changed to the next day. W: You mean the 18th? M: Yes, and the exam will start and end one hour earli...
A.
Exam results.
B.
Time for the exam.
C.
Change of class hours.
【单选题】听力原文：M: What was the party like last night, Jane? W: Really Fantastic l There are some interesting people there, and we have had a good time together. Why couldn't you come? M: Well, I had to work ove...
A.
He didn't like the host.
B.
He was not invited.
C.
He has another appointment.
D.
He had a headache after work.
【单选题】— Wha t’ s ____ your class roo m ? — There are some big trees.
A.
in front of
B.
in the front of
C.
in front
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