正确答案: B
下密封环失效
题目:利用液压拉伸器上紧贯穿螺栓时,如果拉伸器的油压仅达到上紧压力的50%时泄油孔就出现漏油现象,这种现象可能是()。
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学习资料的答案和解析:
[单选题]吊缸检查气缸盖的气阀时,主要检查()的损伤情况。
阀面和阀座
[单选题]某些新型大型低速柴油机的气缸盖上,设有用来拆卸缸盖螺帽的液压装置(液压环)和配备了专用环形六角扳手,该扳手的作用是()。
液压装置失效时,用来松开缸盖螺帽
[单选题]() clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
Excessive
[单选题]After the engine is warned, we should() the turning gear before starting up the engine.
take out
[单选题]The operation between two fuel injections is called a ().
working cycle