preparation method短语³⁷⁶⁸⁹ 基本例句 制备方法 The optimal conditions for soluble chitin preparation method is investigated and this method is practical way to comprehensive use of shrimp shell and environmental protection. 探讨了可溶性甲壳素制备的最佳条件，为虾壳的综合利用和环境保护寻出了一条途径。 cnki