单项选择题
A.45% B.46% C.48% D.50% E.52%
A.A B.B C.C D.D E.E
A.2x-11y+16=0 B.2x-11y-16=0 C.2x+11y+16=0 D.3x-11y+16=0 E.3x+11y-16=0