曲轴的微量变形变化越大，臂距差越大，表明曲轴的（），当超过材

【名词&注释】

磨损量(wear loss)

[单选题]曲轴的微量变形变化越大，臂距差越大，表明曲轴的（），当超过材料的许用应力时，就会引起曲轴的裂纹或断裂。Ⅰ.受力越大；Ⅱ.变形越严重；Ⅲ.下瓦磨损量越大；Ⅳ.附加应力越大；Ⅴ.主轴承越低。

A. Ⅰ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅳ
C. Ⅰ＋Ⅱ＋Ⅳ
D. Ⅰ＋Ⅳ＋Ⅴ

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学习资料：

[单选题]If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A. differential of crank-webs
B. indicator diagrams
C. lube oil reading out
D. misalignment of crank-throw

[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A. nuts
B. bolts
C. coil springs
D. stuffing boxe

[单选题]Which factor of the following affects not only the fuels combustion but also the engine’s maintenance?（）

A. cetane number
B. flash point
C. viscosity
D. setting point

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