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【多选题】
下列选项中属于非概率抽样方式的有( )。A.
偶遇抽样
B.
多阶段抽样
C.
目标式抽样
D.
滚雪球抽样
E.
定额抽样
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反馈参考答案：
举一反三
【单选题】How many _____ of water can you see? [ ]
A.
glass
B.
a glass
C.
glasses
D.
some glass
【简答题】阅读理解。 If you know how to study a glass of wine, it can tell you about its history. Studying a wine involves using several senses, not just taste. First, pour the wine into a glass and look at it. Colo...
【简答题】How can glass and plastics be reused?
【单选题】How are the glass menagerie and Laura similar?
A.
inert
B.
colorful
C.
fragile
D.
glass
【简答题】How can you make the egg sink to the middle of the glass? Pour ___________ without __________.
【单选题】As suggested by the text, how can glass be made less brittle?
A.
It can be heated and then cooled quickly.
B.
It can be cooled and then heated slowly
C.
It can be heated and then cooled slowly.
D.
It can be cooled and then heated quickly.
【多选题】当不计体力时，在极坐标中按应力求解平面问题，可归结为求解一个应力函数【图片】，它必须满足下列条件：（ ）。
A.
区域内的相容方程
B.
边界上的应力边界条件
C.
多连体的位移单值条件
D.
区域内的平衡微分方程
【单选题】How long does it take to make out a glass according to Green Glass Company?
A.
Eight months.
B.
Ten days.
C.
Three hours.
D.
Seven minutes.
【单选题】How many _______ can you see on the desk? [ ]
A.
glass of milk
B.
glass of milks
C.
glasses of milk
D.
glasses of milks
【单选题】How can you study in the living room when other people are watching TV? I think you need a ______ place. [ ]
A.
cleaner
B.
quieter
C.
safer
D.
smaller
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