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【单选题】
血液在血管内流动时, 血流阻力与血管口径的关系是:A.
与血管的半径成正比
B.
与血管半径的平方成正比
C.
与血管半径的平方成反比
D.
与血管半径的四次方成正比
E.
与血管半径的四次方成反比
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反馈参考答案：
举一反三
【单选题】It is ______________ that the train has been delayed for almost twenty minutes.
A.
awesome
B.
annoying
C.
wonderful
D.
fantastic
【单选题】Choose the correct order to make the following sentences into a voicemail message from Susan Hill. A. I'm supposed to be meeting him at 11 o'clock. B. The thing is, my train was delayed. C. This is Su...
A.
CEBAFDG
B.
CEAFDBG
C.
CEDBFAG
D.
CEABFDG
【简答题】It is ______________ that the train has been delayed for almost twenty minutes.
【单选题】The train is seriously delayed ______________ the heavy snow.
A.
according to
B.
thanks to
C.
due to
D.
owing to
【简答题】The train is seriously delayed ______________ the heavy snow.
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