Afterensuringthatthe()iscorrectthebearingclearanceshouldbechecked.
A. nap
B. gap
C. nip
D. deflection
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Aftertheengineiswarned,weshould()theturninggearbeforestartinguptheengine.
A. takein
B. putin
C. takeout
D. putup
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