皮皮学，免费搜题
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【单选题】
离心泵为什么要在出口阀门关闭的情况下启动电机?A.
防止离心泵里的液体漏掉
B.
因为此时离心泵的功率最小，开机噪音小
C.
因为此时离心泵的功率最小，即电机电流为最小
D.
保证离心泵的压头稳定
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举一反三
【单选题】Government is believed to differ strikingly from business in that government is characterized by ______.
A.
Its absolute control of power
B.
Its function in preserving personal freedom
C.
Its role in protecting basic American values
D.
Its democratic way of exercising leadership
【单选题】Government is believed to differ strikingly from business in that government is characterized by ______.
A.
its absolute control of power
B.
its function in preserving personal freedom
C.
its role in protecting basic American values
D.
its democratic way of exercising leadership
【简答题】由美国某兄弟农场培育,产仔多、生长最快、性情温顺、对性激素感受性高,在我国广泛使用的封闭群大鼠是A. WistA.r B. SprA.gue-D.A.wley D. C. Long-EvA.ns D. LOU/C.
【单选题】65What is characteristic of work in the 21st century?
A.
Computers will do more complicated work.
B.
More will be taken by the educated young.
C.
Most jobs to be done will be the creative ones.
D.
Skills are highly valued regardless of age.
【单选题】由美国某兄弟农场培育,产仔多、生长最快、性情温顺、对性激素感受性高,在我国广泛使用的封闭群大鼠是
A.
wistar
B.
SD
C.
Long-Evans
D.
LOU/C
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