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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1.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

2.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

3.單項(xiàng)選擇題Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.

A.higher
B.lower
C.the same
D.none of the above

4.單項(xiàng)選擇題Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of （） to develop their full strength.

A.the piston rods
B.the crank throws
C.the thrust bearings
D.the main bearings

5.單項(xiàng)選擇題All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.

A.angled
B.rounded
C.being angled
D.being rounded