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单选题
Which of the listed statements is correct concerning the starting of centrifugal pumps?（）
A
They should always be started with the discharge valve closed
B
They should always be started with the discharge valve opened
C
A priming pump is always required to flood the impeller suction
D
They should always be started with the sealing line valves closed
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更多 “单选题Which of the listed statements is correct concerning the starting of centrifugal pumps?（）A They should always be started with the discharge valve closedB They should always be started with the discharge valve openedC A priming pump is always required to flood the impeller suctionD They should always be started with the sealing line valves closed” 相关考题
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Energy can be created or destroyedB
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单选题Which of the following statements concerning butterfly valves is correct?（）A
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The butterfly valve should never be used in a freshwater system
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单选题Which of the following statements is true concerning centrifugal pumps?（）A
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High conductivity of the distillate indicates distillate salinity is excessiveB
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单选题Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）A
The liquid receiver functions to collect and remove non-condensable gasesB
A thermostatic expansion valve is used to control refrigerated space temperatureC
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单选题Which of the following statements concerning fire-tube boilers is correct?（）A
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Flames impinge on the tubesC
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单选题Which of the following statements is correct concerning the “flash point ” of a liquid?（）A
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It is the temperature at which a substance will spontaneously igniteC
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单选题Which of the listed statements is correct concerning refrigeration systems?（）A
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单选题Which of the following statements is correct concerning the viscosity of lubricating oil?（）A
Viscosity will increase as temperature increasesB
Viscosity is a measure of a fluid s internal resistance to flowC
Viscosity will decrease as temperature decreasesD
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