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前言从50年代开始直到现在,我国焊接钢结构用钢的质量等级划分始终是个空白。为建立我国焊接钢结构钢材质量等级计算方法,首先
Preface From the 1950s until now, China’s quality of steel grade steel division is always a gap. In order to establish the method for calculating the quality grade of welded steel structural steel in our country, firstly