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火山灰
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火山灰
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火山灰
磨成细粉与水拌合后自身并不能够硬化,但与石灰混合并加水拌和成胶泥状态后,既能在空气中硬化又能在水中继续硬化的天然或人工原材料。又称火山灰质混合材。
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火山灰
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火山灰
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Ruijin revolutionary sites
Ruijin Scenic and Historic Area
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Ruili-Daying River Scenic and Historic Area
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Ruined Mṛgadāva Buddhist Temple at Sārnāth
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Ruins of Kilwa Kisiwani
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Rujiazhuang Tombs of Western Zhou Dynasty
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