题目内容

Lubricatingsystemsfordieselenginesareusuallydesignedtoinitiallyprovidelubeoiltotheengine（）

A. camshaftbeatings
B. mainbearings
C. pistoncrowns
D. cylinderwalls

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Ifthevalvetappetsinadieselenginearesetatgreaterclearancesthanthosespecifiedbytheenginemanufacturer,thosevalveswill（）

A. openlateandcloseearly
B. openlateandcloselate
C. failtoopenwhentheengineiscold
D. failtoopenatnormaloperatingtemperature

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RegardingaDieselenginecrankcase,thegeneralarrangementandinstallationshouldprecludethepossibilityof（）

A. freeentryofairtothecrankcase
B. waterenteringthecrankcasewhileenginewash-downsarebeingperformed
C. excessiveoilleakageduringperiodsofincreasedblow-by
D. sub-coolinginternalcomponents

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FLOATING，NOTCONTROLLED，WITHOUTACLEARLYDETERMINABLEDIRECTIONmeans（）.

A. Grounding
B. Sailing
C. Adrift
D. Runningintodanger

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以下不是防爆片的优点的是（）。

A. 密封性能好
B. 反应动作快
C. 不易受介质中粘污物的影响
D. 能反复使用

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Lubricatingsystemsfordieselenginesareusuallydesignedtoinitiallyprovidelubeoiltotheengine（）

A. camshaftbeatings B. mainbearings C. pistoncrowns D. cylinderwalls

Ifthevalvetappetsinadieselenginearesetatgreaterclearancesthanthosespecifiedbytheenginemanufacturer,thosevalveswill（）

RegardingaDieselenginecrankcase,thegeneralarrangementandinstallationshouldprecludethepossibilityof（）

FLOATING，NOTCONTROLLED，WITHOUTACLEARLYDETERMINABLEDIRECTIONmeans（）.

以下不是防爆片的优点的是（）。

A. camshaftbeatings
B. mainbearings
C. pistoncrowns
D. cylinderwalls