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The above symbols should be put in the proper position of film, and the distance from weld edge should be at least 5mm (see picture3).
上述定位标记和识别标记均应放在胶片的适当位置,并离焊缝边缘至少5 mm(图3)。
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Which of the symbols below describes the weld shown?
以下哪一个符号正确描述了所示焊缝?
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