单项选择题
When securing a flash-type evaporator for an extended period of time, you should （）.
A.fill the unit with saltwater
B.fill the unit with de-scaling compound
C.completely drain the unit
D.tightly seal the unit to exclude air
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相关考题
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单项选择题
A distinguishing feature of an educator, when compared to other pumps, is the （）.
A.dischargeendbeingsmallerthanthesuctionend
B.smallsizeofimpeller
C.lackofmovingparts
D.easeatwhichthewearingringsmaybechanged -
单项选择题
The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.
A.fusion
B.vaporization
C.sublimation
D.condensation -
单项选择题
Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）
A.Overcoming sliding friction
B.Overcoming rolling friction
C.Overcoming fluid friction
D.Overcoming oil wedge friction
