So,technical innovation of casing scratcher is done.Free swivel joint is successfully applied.
但某些工具在施工中不能完全满足施工质量和施工安全的要求。
So,technical innovation of casing scratcher is done.Free swivel joint is successfully applied.
但某些工具在施工中不能完全满足施工质量和施工安全的要求。
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