["Задаю вопрос, включает ли C 9+ C 9? C 9 включает ли C 9?", "Задаа вопрос, включает ли C 7 C 9? C
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请教各位，C 9+包括C 9吗？C 9- 包括C 9吗？
C9+包括C9，C9-不包括C9
谢谢，是约定俗成还是有权威定义？
C9+文字定义为碳九及碳九以上组份，C9-文字定义为碳九以下组分。
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