dry bulk density短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 干容重 On the basis of a high correlation coefficient of the relationship between dry bulk density and porosity of soil, the empirical formula of porosity of soil has been established. 过去我们利用土壤于容重和孔隙度之间的高相关关系，建立了一个土壤孔隙度经验公式。 cnki