单项选择题When the starting air valve closes on one cylinder, another starting air valve has () opened on another cylinder whose piston has just commenced its downward stroke.

A.just
B.nearly
C.merely
D.already


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1.单项选择题When the order () is received from the bridge, the main air stop valve in the starting air line should be shut.

A.stand-by engine
B.full ahead
C.finished with engine
D.full away

6.单项选择题Vents are led from the engine to head tank () from the cooling water.

A.for the release of air
B.for the release of water
C.in order to the release of air
D.because the release of air

8.单项选择题Valve overlap is the period during which ().

A.the inlet valve is open
B.the exhaust valve is open
C.both valves are closed
D.both valves are open

9.单项选择题Valve gear knocks are more easily located while the engine ().

A.is running
B.stops
C.is repaired
D.lacks of oil

10.单项选择题VIT means ()

A.variable injection timing
B.variable inlet tonnage
C.vertical incoming tonnage
D.vertical inlet tank