... double-welded butt joint 双面焊对接接头 welded butt joint with back 带垫板单面对接焊 single-welded butt joint with back 带垫板单面对接焊 ...
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single-welded butt joint with back 带垫板单面对接焊
welded butt joint with back
背面焊接对接
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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