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问题 51.如图中坡口形式,请问哪部分被称作钝边? 52.根据GB985-80规定,下列哪种标注方式表示需要双面焊接?
Question 51. As shown in the groove form, which part is called the blunt? 52. According to the provisions of GB985-80, which of the following marking means that the need for double-sided welding?