单项选择题

Theoretical perfect combustion in a diesel engine yields by-products of （）.

A.aldehydes and carbon dioxide
B.water vapor and carbon monoxide
C.nitrogen and carbon monoxide
D.water vapor and carbon dioxide

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单项选择题
Which of the following devices is a common basic element with nearly all mechanical governors?（）

A.Power piston
B.Control rack
C.Weights acted on by centrifugal force
D.Isochronous droop spring
单项选择题
A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.

A.air turbulence
B.fuel penetration
C.fuel spray angle
D.fuel injection rate
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