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【简答题】
某浆砌块石护拱,体积40 m3 ,采用7.5号水泥砂浆砌筑,问所需水泥和中(粗)砂。第一步找定额,定额表中水泥砂浆标号一致,故不需抽换,完成10m3实体的浆砌块石护拱,需32.5级水泥和中(粗)砂的用量明确,第二原定额中32.5级水泥的用量0.718t如何得出的? 请写出计算公式得出结果。
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