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煤炭工业部颁布的《中国煤炭可选性评定标准》已于1982年1月1日开始生效。该标准规定,按分选比重±0.1的比重物含量的多少(简称±0.1含量法)划分煤炭可选性等级。分选比重±0.1比重物含量W_n可从可
The “China Coal Optional Evaluation Standards” promulgated by the Ministry of Coal Industry came into effect on January 1, 1982. The standard provides, according to the proportion of the proportion of ± 0.1 fraction content (referred to as ± 0.1 content method) classification of coal grade of choice. The proportion of sorting ± 0.1 specific gravity content W_n can be from