连杆螺栓如发现少量螺纹损坏则应该（）。

【名词&注释】

螺旋桨鸣音

[单选题]连杆螺栓如发现少量螺纹损坏则应该（）。

A. 用板牙修牙
B. 用锉刀修牙
C. 换新
D. 用砂纸打磨

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学习资料：

[单选题]废气锅炉出口排烟温度t2不应低于露点，为了最大限度利用排气余热，在标定工况下，t2=露点+△t（℃），式中△t不应小于（）℃.

A. 25
B. 30
C. 40
D. 50

[单选题]消除螺旋桨鸣音的办法是将随边0.4R～0.8R部分（），从而改变涡流引起的振动频率。

A. 质量改变
B. 形状改变
C. 改变尺寸
D. 改变螺距

[单选题]The power generated in the turbine must （） that required by the compressor.

A. be less than
B. be larger than
C. be as large as
D. not be so large a

[单选题]When the fuel oil is burning in the combustion chamber, it （）.

A. gives up large amount of heat
B. gives off large amount of heat
C. gives up large amount of steam
D. gives off large amount of steam

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilutio

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