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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单项选择题
Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.

A.TBN number
B.viscosity
C.temperature
D.foaming
单项选择题
The lower section of a piston is called the （）.

A.land
B.skirt
C.crown
D.plate
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