A . R正=0.174、R矩=0.15、R圆=0.195
B . R正=0.15、R矩=0.174、R圆=0.195
C . R正=0.1、R矩=0.5、R圆=0.5
D . R正=0.195、R矩=0.15、R圆=0.174