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單項(xiàng)選擇題

Blow-off of the relief valves of the engines cylinders may be caused by （）.

A.too low lead
B.water in fuel
C.too tight spring
D.leakage

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單項(xiàng)選擇題

Before starting the turning gear, （） should be worked by hand to minimize corrosive action on the liners.

A.the indicators
B.the starting valves
C.the cylinder lubricators
D.the turning gear

單項(xiàng)選擇題

Before starting the engine the air bottle should be （）.

A.pumped up
B.loaded
C.discharged
D.opened

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