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單項(xiàng)選擇題

（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.

A.Diffusers
B.Compressors
C.Steam boilers
D.Soot blowers

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單項(xiàng)選擇題

（） provide the water to the pistons.

A.Pneumatic pipes
B.Hydraulic pipes
C.Telescopic pipes
D.Operating gas pipes

單項(xiàng)選擇題

（） is used for washing and drinking.

A.The ballast system
B.The salt water system
C.The bilge system
D.The domestic system

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