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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶辅助机械

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

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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
单项选择题
The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

A.weight designation
B.viscosity index
C.pour point
D.thermal change value
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