A.-2或-1/2 B.-2或1/2 C.2或-1/2 D.2或1/2

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问题 A.-2或-1/2B.-2或1/2C.2或-1/2D.2或1/2E.2或-2

选项 A.-2或-1/2
B.-2或1/2
C.2或-1/2
D.2或1/2
E.2或-2

答案 B

解析
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