單項選擇題Which one of the followings may not be checked before engine starting?()

A.tank level
B.Various filters
C.Drains
D.seawater temperature


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1.單項選擇題The is employed to warm up a large diesel engine before its starting()

A.hot air
B.hot boiler water
C.cylinder water
D.hot seawater

2.單項選擇題In slow speed two-stroke engines,()the fresh air entering begins when and stops as()

A.the inlet port is opened by the up coming piston; the port is closed by the down going
B.the inlet valve is opened by the down going piston;the inlet valve is closed
C.the inlet port is opened by the down going piston;the port is closed by the up coming
D.the inlet valve is opened