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
请回答下列问题:
西亚与下列哪一个地区的地理特征最相似
关于向心力的下列说法中正确的是( )
"The story of the red-crowned crane" ____ (write) in memory of Xu Xiujuan.