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一个英语句子求语法错误?

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一个英语句子求语法错误?
After dissolved sample solution under test according to standard,dilute it with complete mediumⅠto 200 IU/ml
那是medium I to 写一块了
一个英语句子求语法错误?
缺主语
After dissolvING sample solution under test according to standard,WE dilute it with complete mediumⅠto 200 IU/ml