加工成承插焊和螺纹混合的连接型式。
Fittings can also be processed into the combination models of socket and threading.
在最基本的型式下，继电器依次连接第一个通道到最后一个通道。
In its most basic form, relay closure proceeds from the first channel to the last.
介绍了油井管的几种连接结构及其密封型式。
Knowledge about several connection ways and sealing types for oil-well pipes are given in the article.
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