This paper introduces the availability of four wheat-straw processed by different method, put emphasis upon density, compression strength and castability of Flowing Straw-Cement composition.
本文介绍了经不同方法加工处理后四种麦秸秆的可用性能，着重研究了流动性秸秆水泥复合材料的密度、强度以及可浇注性。
Coal maceral concentrates of high purity were prepared from four different rank coals by Density Gradient Centrifugation method.
经等密度梯度离心分离，从褐煤、长焰煤、气煤和贫煤四种不同变质程度煤中获得了高纯度的有机显微组分。
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