单项选择题
The （）is fitted on an oily water separator.
A.sliding bowl bottom B.gravity disc C.bowl D.liquid level detector
单项选择题 The （）is not a component of an oil separator.
单项选择题 The （）pump is usually used as the lubricating oil pump.
单项选择题 The reciprocating pump can’t draw water from a tank may be caused by （）.
