单项选择题
Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A.Splash
B.Gravity
C.Pressure
D.Bypass
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The crankcase of many diesel engines are kept under a slight vacuum by the （）.
A.scavenging action of the piston
B.piston type vacuum pump taking suction off a differential manometer
C.gland exhausting manometer
D.crankcase exhaust fan -
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Fins are installed on the generating tube surfaces in waste heat boilers to （）.
A.prevent soot fires in the exhaust system
B.prevent exhaust gas erosion of the tubes
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单项选择题
On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A.a spindle lubricator
B.an oil jet
C.internal splashing
D.drilled passages in the crankshaft
