题目内容

Combustionknockoccurringinadieselenginecanbecausedby()

A. lowcoolanttemperature
B. insufficientfuel
C. highambienttemperature
D. carbonbuildupontheinjectortips

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Thatthescaleofanypartofacharttobelargerthanthescaleofthesurveyis().

A. veryrare
B. common
C. often
D. reasonable

Whichoftheitemslistedcausesadirectactingmechanicalgovernortooperatetheenginefuelcontrollinkage?()

A. Hydraulicoilpressure
B. Servomotoraction
C. Flyweightcentrifugalforce
D. Relaymotion

绘制电气控制线路图时,因接触器线圈属耗能元件,通常画在控制电路的()。

A. 上部
B. 下部
C. 中部
D. 任意位置

Whichoftheconditionslistedmayoccurinanoperatingdieselengineifairpocketsformwithinthecylinderheadcirculatingwaterpassages?()

A. Hydraulicstressanddistortionwilldevelop
B. Hotspotswilldevelop
C. Fueloilviscositywillincreased
D. Anincreaseintrappeddepositsofscaleanddirt

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