某一条无差异曲线由XY=48表示,下列哪两种商品组合是处于这一条无差
A.X=12,Y=5;X=10,Y=6
B.X=12,Y=4;X=10,Y=6
C.X=12,Y=4;X=7.5,Y=6.4
D.X=15,Y=5;X=10,Y=7.5
正确答案是C
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