题目内容

Aftertheengineiswarned,weshould（）theturninggearbeforestartinguptheengine.

A. takein
B. putin
C. takeout
D. putup

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Althoughthecrankshaftsofmediumdieselenginesappeartoberobust,theyrelyonthesupportof（）todeveloptheirfullstrength.

A. thepistonrods
B. thecrankthrows
C. thethrustbearings
D. themainbearings

Analuminumpistonhaslowerinertiaandhighercoefficientof（）comparedtothatofcastiron.

A. viscosity
B. twistingmoments
C. inertia
D. thermalexpansion

泡沫灭火剂可以与（）相混。

A. 油
B. 醇
C. 酸、碱
D. 同类型同批次生产的泡沫

Anincreaseinloadonadieselengineresultsin（）ofspeedofthecrankshaft.

A. areduction
B. anincrease
C. anouting
D. adownwards