Althoughthecrankshaftsofmediumdieselenginesappeartoberobust,theyrelyonthesupportof()todeveloptheirfullstrength.
A. thepistonrods
B. thecrankthrows
C. thethrustbearings
D. themainbearings
查看答案
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
()是指在灭火过程中,从开始向燃料喷射泡沫,至90%燃烧面积的火焰被扑灭的时间。
A. 25%析液时间
B. 90%火焰控制时间
C. 比重
D. 涨合比