Rectangle PQRS lies in the xy-coordinate plane so that its sides are not parallel to the axes. What is the product of the slopes

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问题 Rectangle PQRS lies in the xy-coordinate plane so that its sides are not parallel to the axes. What is the product of the slopes of all four Sides of rectangle PQRS?

选项 A、-2
B、-1
C、0
D、1
E、2

答案D

解析
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