单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）

A.inevitable
B.harmful
C.helpful
D.unacceptable