Report - 關鍵解析 - nani.com.t€¦ · 2 ＝4 恰含1 個苯環結構。 (2)根據題意C7H6Br2 為甲苯衍生物且2 個溴皆取代於苯環上，則知苯環上共有2 個Br 取代及1

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