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輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.14)

單項(xiàng)選擇題
A gear pump belongs to （） according to its working principle.
A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
單項(xiàng)選擇題
Which of the following pumps belongs to centrifugal pump?（）
A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
單項(xiàng)選擇題
What color is used to indicate the last shot of anchor chain?（）
A.Red
B.White
C.Blue
D.Yellow
單項(xiàng)選擇題
（） will be used to blow away the combustion products from the tube surfaces.
A.The blow down valve
B.The scum valve
C.The air release cock
D.The soot-blower
單項(xiàng)選擇題
In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
A.an diesel oil heater
B.a waste heat boiler
C.a fresh water generator
D.all the above

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