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【单选题】
用于衡量色谱柱的分离效能高低的参数为（）A.
t R
B.
R
C.
H
D.
n
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【单选题】对建筑承包商而言，在( )情况下，可以采用固定总价合同。
A.
开工前对工程内容尚不十分清楚
B.
开工前才有完备的施工图
C.
设计图纸和技术说明书相当详细
D.
有施工图但对工程的某些条件尚不清楚
【单选题】Thousands of people perished in the storm.
A.
died
B.
suffered
C.
floated
D.
scattered
【单选题】when the spacecraft was going to land______
A.
it produced a lot of noise
B.
there were scattered showers
C.
people could see it high in the sky
D.
people could neither see nor hear it
【单选题】对承包商而言，在( )的情况下，采用固定总价合同是比较合适的。
A.
开工前对工程内容尚不十分清楚
B.
没有施工图就开工
C.
设计图纸和技术说明书相当详细
D.
有施工图但对工程的某些条件尚不清楚
【单选题】American Karoshi (过劳死) Workaholics(工作狂)in America A thin, 40-something man with scattered white hair and wan(苍白的)complexion looked up from his notebook in a church basement on Manhattan's Upper West S...
A.
Y
B.
N
C.
NG
【单选题】The United States has greatly ______ its influence into the world affairs.
A.
spread
B.
scattered
C.
distributed
D.
extended
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