Proper lubrication of the main bearings is more easily obtai

【名词&注释】

持续性(persistence)

[单选题]Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

A. The direction of pressure on the journal in four-stroke engine is continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engines

查看答案&解析查看所有试题

学习资料：

[单选题]进入货舱取样前货舱要通风舱壁没有潮气并进行()。

A. 货舱驱气
B. 货舱除气
C. 货舱清洗

[单选题]动脉出血特征为______。

A. 缓慢、持续性，颜色暗红
B. 喷射状、随心搏动而增强，色鲜红、量多
C. 涌出状、色鲜红、量不多
D. 以上都不对

[单选题]下列说法中正确的是________。

A. 追越船是否“均应给被船让路”，将取决于是否致有构成碰撞危险
B. 不管是否构成碰撞危险，追越船均应给被追越船让路
C. A和B都对
D. A和B都不对

本文链接：https://www.51ksbd.net/show/7dx5n7.html