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【单选题】
Which of the following explains the essence of quota sampling?A.
Each element of the population has an equal chance of being chosen
B.
Every nth member of the population is selected
C.
Every element of one definable sub-section of the population is selected
D.
None of the above
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举一反三
【简答题】___________编码器是靠脉冲计数,失电容易丢失脉冲,开机需要找参考点。
【多选题】Unit2-7 Fill in the blanks with the expressions given below. Change the form where necessary. Each expression can be used only once. prepare for，be bound to， stand up for in favor of， speculate abo...
A.
are liable to
B.
in favor of
C.
is bound to
D.
speculate about
E.
invested…with
F.
stand up for
G.
in the form of
H.
prepared… for
I.
in the company of
J.
in succession
【简答题】市场机制包括（ ）。
【简答题】From the 18th week on, you're required to upload your presentation of the English novel you've read onto the online classroom, make sure you make it in the form of PPT, and a report in the form of WOR...
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