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【多选题】
哪些是卷烟零售客户满意度调查抽样要求：（）。A.
调查样本总量按照区域卷烟零售客户总数的10%抽取，有效问卷回收率不少于97%。
B.
采用随机抽样的方法；为保证样本的代表性和分析研究需要，调查对象的选择需由调查主体负责抽样，调查对象确定后不随意更改。
C.
在确定总样本量的基础上，若既有城市客户、又有农村客户，应先按城市、农村分成两部分，再按城市卷烟零售客户样本量占总样本量60％、农村卷烟零售客户样本量占总样本量40％的比例进行抽取
D.
计算卷烟零售客户满意度
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【单选题】—Our son has picked up some bad habits recently, and I am really worried about it. — .
A.
Yes, they have some bad habits.
B.
Cheer up. I believe he will overcome it.
C.
Well, he likes picking things up when he is out.
【简答题】简述汽车防爆膜的功能,试述防爆膜的贴膜步骤 ?
【单选题】Look! The two women_____some tea leaves. A. pick up B.picked up C.are picking up D.have picked up
A.
pick up
B.
picked up
C.
are picking up
D.
have picked up
【单选题】He_____ some German while he was away on a business trip in Berlin.
A.
picked out
B.
picked up
C.
gave up
D.
gave out
【单选题】When the old man saw some litter on the ground, he quickly .
A.
picked it up
B.
picked up it
C.
picked them up
D.
picked up them.
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