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    һ߲ܽʵ֤ڸ߲ܽеӦǾúģرǽձõͬ
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ʱֻ6Ͳƻ1975꺣ǵʱ30റ׻չ΢ڽש콨;1976ɽʱа׼ׯһ¥ؽ700kg/m2ʱڵҶΪ6ǿ£ûгµѷ죬50mIJϽṹסլ²ȴбѷ졣
    Ϻıܺã200mm

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ǽıЧ൱490mmשǽıЧںĽЧͻо
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