A、B两种有机化合物,分子式都是C 9 H 11 O 2 N。 (1)化合物A是天然蛋白质的水解产物,光谱测定显示分子结构中不存在甲基。化合物A的结构是___________。 (2)化合物B是某种分子式为C 9 H 12 的芳香烃一硝化后的唯一产物(硝基连在苯环上)。化合物B的结构是_______________。 (3)两分子A可形成具有六元环的物质C,则C的结构是______________。
【简答题】Follow the tape and read the following text aloud until you are familiar with it , Then record the text you read The Costs in a Feasibility Study A feasibility study is the financial ysis of all t...
【简答题】Follow the tape and read the following text aloud until you are familiar with it,Then record the text you read. 提示:跟读课文录音带,完成下面课文内容的朗读,读熟后完成录音提交。 P7 Bill of quantities . Each unit price includes both ...
【简答题】Follow the tape and read the following text aloud until you are familiar with it,Then record the text you read. 提示:跟读课文录音带,完成下面课文内容的朗读,读熟后完成录音提交。提交时注明第几单元第几段 班级 姓名。 P10 Reinforced concrete Reinforced ...