The research of the composite index number (PI) of soil quality in different soil locations suggests that, the soil quality index increases as the altitude of mountain slope location decreases.
山体坡面不同坡位下土壤质量综合指数(P i)研究表明土壤质量指数随山体坡面位置相对海拔高度的降低而增高。
The index works by taking a weighted average of the price of imported iron and domestically produced iron ore to produce a composite number.
这种指数通过对进口铁和国产铁矿石取以加权平均价格以此产生一个合成数。
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