However, there exists an amount of space on the study of soil surface variation.
而在土壤表层水盐变化规律这方面，仍存在研究空间。
The surface variation and pore structure were observed and measured with SEM and GC CO2 absorption techniques.
用SEM和CO_2等温吸附技术考察了不同转化率下煤焦的孔结构形貌和比表面变化。
In this paper, basing on the profile model of variable electric property, the normal background value is calculated to eliminate the influence of surface variation.
本文以“变化电性剖面模型”为基础，计算出正常背景值，以消除表层变化的影响。
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