單項(xiàng)選擇題

A connecting rod in a four-stroke/cycle diesel engine is subject to（）

A.tension load twice each crankshaft revolution
B.compression load during power and compression strokes
C.inertia load once every four crankshaft revolutions
D.bending loads at bottom and top dead center

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單項(xiàng)選擇題

Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）

A.cooling water leaving each cylinder
B.fuel oil entering the injector
C.exhaust gases at various locations
D.lube oil at the bearing supplies

單項(xiàng)選擇題

Low compression pressure in a diesel engine is caused by（）

A.low water in the expansion tank
B.improperly seated valves
C.low fuel oil pressure
D.worn or broken cylinder liner sealing rings