By researching microbial characteristics of tobacco straw overburden to determine which season and which collocation ratio was the most suitable for decomposition of the tobacco straw overburden.
通过研究烟草秸秆覆盖层的微生物特征，确定何种季节何种烟草秸秆与鸡粪的搭配比例最适合烟草秸秆覆盖层的腐解。
The ratio of overburden of the north part to no. 6 line is calculated.
以6号勘探线北部为例计算了剥采比。
The statistical results show that the clays have high water contents, and the ratio of their vane test strength vs. the effective overburden pressure ranges from 0.2 to 0.4.
统计表明该浅层软土含水量高、原位十字板剪切强度和有效上覆应力的比值约为0．2-0．4。
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