A.(1,2) B.(1,0.5) C.(2,0.5) D.(2,1)A.(1,2) B.(1,0.5) C.(2,0.5) D.(2,1)

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问题

选项 A.(1,2)
B.(1,0.5)
C.(2,0.5)
D.(2,1)

答案C

解析
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