The first chapter is the analysis of the background of the value-added tax transformation.

第一章对增值税转型的背景进行了分析。

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After Genetic background analysis of Streptomyces diastaticus No. 7 strain M1033, the modified conditions of M1033 protoplasts and transformation were established.

对7号淀粉酶菌M1033的遗传背景进行分析，建立了其原生质体制备、转化的优化条件。

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