覆土
Based on Biot's theory of consolidation, the pressure tunnel with partial sealing in saturated soil is investigated by developing the partial sealing boundary conditions.
基于Biot固结理论,研究分析了饱和土体中半封闭压力隧洞问题,建立了压力隧洞的半封闭边界条件。
Soil was treated with microwave digestion, sealing vessel digestion and electric hot plate digestion to detect Cu, Zn, Pb, Cd, Ni and Cr with AAS.
分别用微波消解,密封容器消解和电热板消解3种方法预处理待测土壤,然后以原子吸收分光光度法测定其中铜、锌、铅、镉、镍、铬。
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