GB/T JB/T HB/T YB/T QB/T TM 这些代号是什么意思？ - 百度知道
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hb／t是中国航空行业推荐性行业标准，，其中h表示航空，b表示标准，t表示推荐，是包括语编码系统的国家标准码。 yb/t是中华人民共和国黑色冶金行业推荐性标准，其中y表示黑色冶金，b表示标准，t表示推荐。由全国耐火材料标准化技术委员会提出并归口。
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