广泛基础指数 Broad-Base Index 定义： 用做反映总体市场活动情况的指数。
这是一个基础广泛的股票指数，组成30家公司和它的价格的加权。
It is a broad based stock index, comprised of 30 companies and it is price weighted.
为更好地表征重烃，以广泛的数据为基础，开发了芳香度关联指数aci。
To have a good characterization of heavy hydrocarbons, the aromaticity correlation index has been developed on the basis of a wide range of data.
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