单项选择题
A.reduce the turbocharger operating temperature
B.increase the pressure of the inlet air
C.increase the density of the inter air
D.reduce the blower operating temperature
单项选择题 Early fuel injection timing is indicated by the cylinder pressure being（）
单项选择题 Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）
单项选择题 Performance of a turbocharged engine can be improved by（）