试题与答案

油封发生漏油时,其原因是()。A、皮碗的内园和外壳园不同心 B、弹簧圈过松 C、油封

题型:多项选择题

题目:

油封发生漏油时,其原因是()。

A、皮碗的内园和外壳园不同心

B、弹簧圈过松

C、油封的外径过小

D、护油唇口的宽度不够

答案:

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