A:我国北方的乡村聚落
B:我国南方的乡村聚落
C:我国西北的乡村聚落
D:我国青藏地区的乡村聚落
—It's a very nice , but I really can't accept it.
读图回答问题.
用直尺和圆规作一个角的平分线的示意图如图所示,则能说明∠AOC=∠BOC的依据是( )