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Which statement about diesel engine combustion is true?（）

A.Combustion does not begin until the piston starts down on the power stroke
B.Maximum combustion pressure is reached before TDC
C.Turbulence in the cylinder causes a delay in ignition
D.Maximum cylinder firing pressure is not developed until the piston passes TDC

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Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.

A.performance
B.horsepower output
C.fuel consumption
D.scavenge effect

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Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.

A.low compression pressure
B.increased piston wear
C.increased cylinder lube oil consumption
D.poor contact between compression rings and liner

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Which statement about diesel engine combustion is true?（）

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Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.

Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.