Meanwhile, there were not significant differences in wood air dry density, mechanical strength and cell wall percentage of intra provenance.

种源内木材气干密度、力学强度及胞壁率差异不显著，管胞长、宽和壁厚的差异均显著且高于种源间的差异。

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The paper discusses the difference between coal dry beneficiation with air dense medium fluidized bed and other traditional separations in keeping density stability.

分析了空气重介质流化床选矿方法与其他传统选煤方法在保持密度稳定性方面的差异。

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