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词汇
protective gas
释义
protective gas
基本
例句
保护气体
The PQR shall include the composition and flow rate of the shielding and inert gas backing, when used.
焊接工艺评定记录单上应包括封底焊时所用的惰性保护气体组成成分和流率。
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更新时间:2026/7/23 19:46:41