單項選擇題Each cylinder has one starting valve which is usually opened by air pressure and closed by ()

A.nuts and bolts
B.new joints
C.spring force
D.sealing rings


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3.單項選擇題During the suction stroke, the piston is moving ().

A.inwards
B.outwards
C.downwards
D.upwards

4.單項選擇題During the inspection, the starting air valves should be closed () the engine from turning.

A.to increase
B.to speed up
C.to prevent
D.to reduce

5.單項選擇題During repair,lubrication lines and orifices must be ().

A.taken away
B.engaged
C.connected
D.sealed off