单项选择题When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid () high bending moments on it.

A.compressing
B.interposing
C.imposing
D.pounding


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3.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

5.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

6.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

7.单项选择题VIT means ()

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

8.单项选择题Under manoeuvring condition the main engine may run on ().

A.gas oil
B.marine diesel oil
C.residue oil
D.crude oil