画圆时，圆规两角间的距离是请选择ABCD*[3`/t'r.\7?'?1j6E5L9w*O;m
A．直径'?1j6E5L9w*O;m
B．半径'?1j6E5L9w*O;m
C．周长'?1j6E5L9w*O;m
D．面积'?1j6E5L9w*O;m