萃取及反萃取的理论级数分别为8级和9级。
Extraction and stripping Numbers of theoretic stages are 8 and 9 respectively.
计算示例表明，图解法求得的理论级数与精确计算结果差别较大。
A calculation example demonstrates that the theoretical stage number obtained by graphics is largely different from that by the proposed method.
对多组份串级萃取理论级数计算公式进行了研究，并推导出多组份串级萃取理论级数计算公式。
Formulae for calculating the number of stages in multi-component cascade extraction are constructed in this paper.
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