题目内容

（）thewayfromShanghaitoJapan，theshipencounteredheavyweather.

A. On
B. At
C. During
D. In

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Theexpansiontankinadieselengineclosedfreshwatercoolingsystemislocatedat（）

A. thehighestpointinthesystem
B. thelowestpointinthesystem
C. nearthefloor
D. platelevelornearthetanktoplevel

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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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（）thewayfromShanghaitoJapan，theshipencounteredheavyweather.

A. On B. At C. During D. In

Theexpansiontankinadieselengineclosedfreshwatercoolingsystemislocatedat（）

Lubricatingsystemsfordieselenginesareusuallydesignedtoinitiallyprovidelubeoiltotheengine（）

Ifthevalvetappetsinadieselenginearesetatgreaterclearancesthanthosespecifiedbytheenginemanufacturer,thosevalveswill（）

RegardingaDieselenginecrankcase,thegeneralarrangementandinstallationshouldprecludethepossibilityof（）

A. On
B. At
C. During
D. In