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| apparent pore percentage (【技】与大气相通的气孔叫开口气孔。显气孔率即开口气孔率，是开口气孔体积与试样总体积的百分比率。显气孔率是评价耐火原料或制品质量的重要指标。); open pore percentage | |||
| open porosity | |||
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