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【单选题】
某地正常成年男子红细胞均数为480万/mm3,标准差为41万/mm3，产生此标准差的根本原因主要是( )A.
个体差异
B.
抽样误差
C.
测量误差
D.
以上都不对
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【简答题】Complete the following sentences with the words or phrases in the box. Change the form where necessary. represent domestic neat rural origin be rich in stage a comeback earn respe...
【单选题】The staff who work in public places would favor the ban because
A.
they don't have to inhale foul air.
B.
they don't have to serve smokers.
C.
they will get more tips fiom non-smokers.
D.
there will be a rise on their salaries.
【单选题】How many people were mentioned who served or would serve the speaker?
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】How many people were mentioned who served or would serve the speaker?
A.
2
B.
3
C.
4
D.
5
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