正确答案: A

The direction of pressure on the journal in four-stroke engine is continuously

题目：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________.

解析：A

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[单选题]进入货舱取样前货舱要通风舱壁没有潮气并进行()。

货舱除气

[单选题]动脉出血特征为______。

喷射状、随心搏动而增强，色鲜红、量多

[单选题]下列说法中正确的是________。

不管是否构成碰撞危险，追越船均应给被追越船让路