皮皮学，免费搜题
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搜题
【单选题】
被输送液体贮槽液面上方压强越低，则离心泵的最大允许安装高度（）A.
越低
B.
越高
C.
该压强与最大允许安装高度没有关系
D.
不好说
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举一反三
【单选题】______refers to the abstract lingusitic system shared by all the members of a speech community.
A.
Parole
B.
Langue
C.
Competence
D.
Performance
【单选题】In politics, astronauts are generally______.
A.
democrats
B.
republicans
C.
conservatives
D.
communists
【单选题】Why is it that the global telegraph network truly revolutionary?
A.
It renders virtual communities worldwide feasible.
B.
It facilitated the breakup of pervasive provincialism.
C.
It makes real time global news service possible.
D.
It accelerated the liberalization of world trade.
【单选题】These sessions mark the achievements of mankind in the fields of ______.
A.
electronic communications, energy and education
B.
sports technology, film-industry and environmental protection
C.
network technology, high-tech industries and traffic
D.
medicine, weather broadcast and finance
【简答题】管理工作的内容包括了 决策, , , 以及创新 等一系列工作。
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