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【单选题】
离心泵叶轮按( )分为泵和泵。A.
叶片弯度方式
B.
进水方式
C.
前后盖板不同
D.
旋转速度
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皮皮学刷刷变学霸
举一反三
【单选题】Emotions are significant for man ' s survival and adaptation because ______.
A.
they provide the means by which people view the size or shape of objects
B.
they are the basis for the social feeling of agreement by which society is maintained
C.
they encourage people to perform. dangerous achievements
D.
they generate more love than hate among people
【单选题】. The organization’s _____ are to provide food for homeless people and help them find somewhere to live.
A.
aims
B.
rules
C.
suggestions
D.
profits
【简答题】我国城市大气污染是以()和()为主要污染物的煤烟型污染。
【单选题】We should consider the professor’s advice _______ our school library provide more books on popular science.
A.
that
B.
when
C.
which
D.
where
【简答题】我国的大气污染以煤烟型为主, 和 是主要污染物。
【单选题】Iribarne' s goal of forming the foundation is to______.
A.
bring fun to poor kids
B.
provide soccer balls for children
C.
give poor kids a chance for a better life
D.
appeal to soccer players to help poor kids
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