单项选择题
A.0.50,0.306 B.0.612,0.306 C.0.306,0.612 D.无法确定
A.-1.475,142.32 B.-1.475,284.64 C.1.475,-284.64 D.1.475,-142.32
A.图(a) B.图(b) C.图(c) D.图(d)