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Air scavenging of a diesel engine cylinder__________.A.blows out the exhaust gasesB.suppli

Air scavenging of a diesel engine cylinder__________.

A.blows out the exhaust gases

B.supplies oxygen for combustion

C.cools the valves and cylinder walls

D.all of the above

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第1题

As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into _____.

A.liquid

B.oily mixture

C.emulsion

D.vapor

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第2题

During the PSC inspection, under the provisions of SOLAS 74, which one may not be regarded as clear grounds for ships’ detainment?

A.excess amount of oily-water mixtures in bilges

B.insulation of piping including exhaust pipes in engine room contaminated by oil

C.improper operation of bilge pumping arrangements

D.there were an actual emergency

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第3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

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第4题

____ can cause oil flow from water outlet of a separator.

A.Oil inlet valve opening too quickly

B.Oil temperature too high

C.Diameter of gravity disc too small

D.Viscosity of oil too low

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