A.89.09 B.109.43 C.178.97 D.93.00
A.A方案 B.B、C两方案均可 C.C方案 D.A、B两方案均可
A.72.47 B.75.45 C.79.6l D.84.66
A.8.31% B.14.31% C.15.69% D.21.69%
A.1 B.2 C.10 D.100
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