单项选择题

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

A.an isochronous governor
B.elastic engine mounts
C.a vibration damper
D.a cast iron bed plate with good flexible qualities

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单项选择题
The air supplied to a diesel engine is compressed to （） (1) provide heat for the ignition of the fuel (2) decrease injection delay

A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) are correct
单项选择题
In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

A.metal particles loosened by wear
B.air when no air cleaners are used
C.condensation of water vapors
D.breakdown of the lubricating oil by dilution
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