She returned to the swivel chair behind her desk.
她回到桌子后面转椅上。
She returned to the swivel chair behind her desk.
她回到桌子后面转椅上。
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要求。
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