crude product preparation
(4), crude product preparation: using cold benzene to dissolve crystal to obtain insoluble substance and benzene dissolved solution, said insoluble substance is hanfangchin B crude product, the concentrated paste to benzene dissolved solution is hanfangchin A crude product.
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crude product preparation
原油制备
以上为机器翻译结果，长、整句建议使用 人工翻译 。