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單項(xiàng)選擇題

An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.

A.manoeuvring operations
B.bad combustion
C.cooling
D.mooring trial

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單項(xiàng)選擇題

An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

A.viscosity
B.twisting moments
C.inertia
D.thermal expansion

單項(xiàng)選擇題

Among the rings of a piston the （） one is subjected to the greatest load and temperature.

A.bottom
B.middle
C.top
D.none of the above