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矿物掺合料
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矿物掺合料
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混凝土
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mineral admixture
矿物掺合料
以硅、铝、钙等的一种或多种氧化物为主要成分,具有规定细度,掺入混凝土中能改善混凝土性能的活性粉体材料。
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Rural left-behind
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Rural Opera Performance on a Winter Day
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