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單項(xiàng)選擇題

（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

A.Too larger
B.Too smaller
C.Excess
D.Excessive

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單項(xiàng)選擇題

（） 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

單項(xiàng)選擇題

（） may have two emergency source of power, thus requiring two emergency switchboards.

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

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