A chemical produced in comparatively small quantities and in a relatively pure state. Pharmaceutical and biological products, perfumes, photographic chemicals, and reagent chemicals are examples.
产量相对较少和较纯态的化学品，例如医药和生物制品、香料、照相药品和试剂化学品。
A chemical produced in comparatively small quantities and in a relatively pure state. Pharmaceutical and biological products, perfumes, photographic chemicals, and reagent chemicals are examples.
产量相对较少和较纯态的化学品，例如医药和生物制品、香料、照相药品和试剂化学品。
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