If your files and database are still there, consider backing them up so that you can investigate them later at leisure, or restore to them if your cleaning attempt fails.

如果你的文件和数据库还在的话，还是把他们备份起来，这样你还可以在闲暇的时候调查一下，或许可以在你试着清除影响失败的时候用上。

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This welding backing is used with all one-side processes. Especially for those which do not demand back bead cleaning.

本衬垫可用于各种单面焊接工艺的位置，特别适用于不一定要求封底焊道的场合。

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