A:sp,范德华力
B:sp2,范德华力
C:sp2,氢键
D:sp3,氢键
形成了欧洲封建等级制度,奠定了西欧骑士制度基础的历史事件是( )
Cooking and LearningIn this E-book package, we have four e-books.
已知:①BrR1 →THFMg BrMgR1 →BrR2 R1﹣R2(THF为一种有机溶剂)
②C6H5﹣O﹣R ①Li,THF,室温②H3O+ C6H5﹣OH
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