单项选择题
A.increase ignition delay
B.affect fuel oil metering
C.affect engine performance at low speed
D.only disappear due to fuel oil abrasion
单项选择题 Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）
单项选择题 When disassembling or assembling an injection pump plunger and barrel you should （）
单项选择题 In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）