为什么电极能止血[题目]咖啡酸具有止血功效.存在于多种中药中.其结构简式如图：则下列有关说法正确的是( )A.该物质中苯环上一氯化物有2种B.所有碳原子不可能都在同一平面上C.既能发生取代反应.也能发生加成反应D.1
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