正确答案: C

表面磨损

题目：针阀与针阀体进行滑动试验时，一般将针阀抽出1/3左右后观察其（）的情况。

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学习资料的答案和解析：

[单选题]废气锅炉窄点较低（）。Ⅰ.可提高废气锅炉的利用率；Ⅱ.废气锅炉应有较大受热面；Ⅲ.废气锅炉废气压力损失较小

Ⅰ+Ⅱ

[单选题]增压器转子动平衡试验合格之后（）。

以上均是

[单选题]双轴系具有高速、（）和（）的特点。

机动性好/生命力强

[单选题]四冲程柴油机停增压器运转，相当于非增压柴油机，但此时工作的主要问题是（）。

气阀重叠角较大，排气倒流

[单选题]Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.

loss of pressure in the lubricating system

[单选题]For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.

crankcase door

[单选题]On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

pressure feed

[单选题]Lubricating oil should be changed on a heavy duty diesel engine when（）.

it has been in use for a specified interval