dropping assembly
dropping assembly
[新英汉石油技术词典]
dropping assembly降斜钻具组合
是什么意思，dropping assembly的解释，dropping assembly的翻译
[石油英汉词典] dropping assembly
dropping assembly
[新英汉石油技术词典]
dropping assembly是什么意思，dropping assembly的解释，dropping assembly的翻译
[石油英汉词典] dropping assembly