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GB 13813-1992; 煤礦用金屬材料摩擦火花安全性試驗(yàn)方法和判定規(guī)則 |
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Archiver|手機(jī)版|小黑屋|機(jī)械社區(qū) ( 京ICP備10217105號-1,京ICP證050210號,浙公網(wǎng)安備33038202004372號 )
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