正确答案: D

白合金

题目：油润滑艉轴承材料常采用（）耐磨合金。

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学习资料的答案和解析：

[单选题]废气锅炉窄点越（），排气的压力损失较（），废气流速必须（）。

小/大/降低

[单选题]柴油机气缸盖产生裂纹后，在分析产生裂纹原因时首先要检查的是（）的问题。Ⅰ.制造质量；Ⅱ.设计；Ⅲ.材质；Ⅳ.管理；Ⅴ.保养。

Ⅳ＋Ⅴ

[单选题]活塞销的主要损坏形式是（）。Ⅰ.磨损；Ⅱ.摩擦；Ⅲ.擦伤；Ⅳ.腐蚀；Ⅴ.裂纹。

Ⅰ＋Ⅴ

[单选题]Cooling of engine is achieved by circulation a cooling liquid around internal passages within the （）.

engine

[单选题]During the inspection, the starting air valves should be closed （） the engine from turning.

to prevent

[单选题]Shims of different thicknesses are inserted between the shells to enable adjustment of （）.

the bearing clearances

[单选题]The diesel engine is a type of （）.

internal combustion engine

[单选题]The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

steel shells

[单选题]Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.

the compression stroke