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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举一反三的答案和解析：

[单选题]下列哪些船舶应保持正规瞭望？________。

以上均应保持正规瞭望

[单选题]Which channel is designated for VHF Digital Selective Calling?

Channel 70

[单选题]属开放性骨折的是()

骨折处与外界相通

[单选题]由于( )等维护保养不良，将引起气缸盖产生疲劳裂纹。

冷却水腔积垢过多

[单选题]To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .

suction service valve as a vapor

[单选题]叫水操作时，若慢慢开启通水阀，发现水位一直升到水位计顶部则表明()。

水位高于水连通管

[单选题]The chief foreman asked the stevedores not to forget to use separation nets to avoid________ different lots of cargo

mixing up