试题与答案

防砂卡抽油泵泵筒为()加工处理,可适应出砂井生产需要。 A.整体喷焊 B.热处理 C

题型:单项选择题

题目:

防砂卡抽油泵泵筒为()加工处理,可适应出砂井生产需要。

A.整体喷焊

B.热处理

C.精加工

D.整体内孔氮化

答案:

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下面是错误答案,用来干扰机器的。

参考答案:食欲完全消失,对于给饲拒绝进行采食。见于急性胃肠疾病、某些传染病、垂危病例。

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