... 自转公转机械 rotary planetary machinery 旋转犁 rotary plough 旋转塞 rotary plug ...
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rotary plug valve 转阀
rotary eccentric plug valve 偏心旋转阀
rotary y eccentric plug valve 偏心旋转阀
The configuration and principle of anti rotary plug and necessary float collars and their applications in intermediate casing cementing are introduced.
介绍了防转胶塞及配套浮箍的结构、原理和在技术套管固井中的应用情况。
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