单项选择题

（） 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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单项选择题
（） provide the water to the pistons.

A.Pneumatic pipes
B.Hydraulic pipes
C.Telescopic pipes
D.Operating gas pipes
单项选择题
（） 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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