单项选择题
A.lower the no-load RPMs
B.provide more air for combine with the fuel
C.increase the no-load RPMs
D.provide more fuel combine with the air
单项选择题 Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）
单项选择题 The rate of pressure rise during the period following fuel ignition in a diesel will result in （）
单项选择题 Higher than normal temperature air passing through the intake of a diesel engine will result in（）