单项选择题

（） supplies pilot air to control the cylinder air start valves.

A.An air compressor
B.An indicator cock
C.An air distributor
D.A safety valve

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单项选择题

A.Large passenger vessels
B.General cargo ships
C.Container ships
D.Oil tankers

单项选择题

A.Cylinder cover
B.Main bearing
C.The exhaust valve
D.The piston movement

单项选择题

A.The bedplate
B.The column
C.The main bearing
D.The double bottom