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。
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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