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【简答题】
齿轮泵困油现象的产生原因是齿轮重合度ε≥ 1 ,会造成( )和( ),解决的办法是在泵盖上加工( ),为减小径向不平力齿轮泵的( )口小于( )口。
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举一反三
【单选题】Jessie Street is sometimes called the Australian Eleanor Roosevelt. Like Roosevelt, Street lived a life of privilege, but she devoted her efforts to working for the rights of the disenfranchised, incl...
A.
Eleanor Roosevelt and Jessie Street worked together to include women in the United Nations Charter.
B.
Usually,people who live lives of privilege do not spend much time participating in political activities.
C.
Discrimination in Australia is much worse than it ever was in the United States.
D.
At the time of the formation of the United Nations,few women were involved in international affairs.
【单选题】The Adventures of Huckleberry Finn, _______ the USA in the mid 19th century, _______ a masterpiece.
A.
set in; proves
B.
setting in; is proved
C.
is set in; proves
D.
was set in; is proved
【单选题】We can infer that the author of this passage ______.
A.
disapproves of Roosevelt's 'New Deal'
B.
thinks the Depression could have been avoided
C.
blames the Depression on the 'Great Crash'
D.
feels there was some similarity between Roosevelt and Hitler
【单选题】Roosevelt, like Churchill, saw the significance of post-war civil aviation, and __________ free and open competition.
A.
believed
B.
trusted
C.
believed in
D.
all of the above
【简答题】黄曲霉毒素( AFT 或 AT )是由 和 产生的一类代谢产物,具有极强的毒性和致癌性,基本结构中均有一个 和一个 。
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