单项选择题
A.pitting B.sludge C.hard varnish D.all of the above
Surface irregularities, such as erosion and pitting on ...
单项选择题Surface irregularities, such as erosion and pitting on injection pump plungers, will（）
A.increase ignition delay B.affect fuel oil metering C.affect engine performance at low speed D.only disappear due to fuel oil abrasion
Oil oxidation, as a result of excessively high lube oil...
单项选择题Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）
A.oil foaming will occur B.large quantities of oil are consumed C.lube oil viscosity is always decreased D.corrosive by-products are usually formed
When disassembling or assembling an injection pump plun...
单项选择题When disassembling or assembling an injection pump plunger and barrel you should （）
A.keep the parts immersed in diesel fuel B.always keep the plunger and barrel together C.work over a linoleum-type surface D.all of the above
