单项选择题

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

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