单项选择题

What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）

A.Rapid increase in temperature with constant pressure
B.Rapid increase in pressure with constant temperature
C.Rapid increase in pressure and temperature
D.Rapid increase in volume and decrease in pressure

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The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.

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