In this paper, the concrete adding by sewer sludge by replacing of natural aggregate was prepared.
本文研究了以管沟污泥等量替代天然细集料制备水泥混凝土.
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It describes the methodology for assessment of natural aggregate resources using remote sensing and airborne geophysics.
报告论述了遥感与大气地球物理学在自然聚合资源评价中的方法.
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