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河沙是一種主要有二氧化矽組成的固體物,從規格上沙可分為細沙、中沙和粗沙.沙子粒徑0.25-0.35mm為細沙,粒徑0.35-0.5mm為中沙,大於0.5mm的由稱為粗沙.沙子都有一定的縫隙,二氧化矽的密度為2.65g/cm3. 所以河沙的密度一般都低於這個數值.一般大約為2t/m³;左右
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