upper seal support
[新英汉石油技术词典]
upper seal support上密封座(方钻杆防喷阀)
是什么意思,upper seal support的解释,upper seal support的翻译
[石油英汉词典] upper seal support
upper seal support
[新英汉石油技术词典]
upper seal support是什么意思,upper seal support的解释,upper seal support的翻译
[石油英汉词典] upper seal support