单项选择题
A.a reduction B.an increase C.an outing D.a downwards
An electrically driven automatically operating auxiliar...
单项选择题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
An aluminum piston has lower inertia and higher coeffic...
单项选择题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
Among the rings of a piston the （） one is subjected to ...
单项选择题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
