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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

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.

A.deflection
B.discrepancy
C.error
D.tolerance

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