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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相关考题
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单项选择题
The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.
A.metering
B.timing
C.rate of injection
D.rate of distribution -
单项选择题
A crankshaft whose center of gravity coincides with its center line is said to be （）.
A.dynamically balanced
B.statically balanced
C.counter balanced
D.resonantly balanced -
单项选择题
When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oil
A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) are correct
