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?
A.
-2
B.
-1
C.
0
D.
1
E.
2
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参考答案:
举一反三
【单选题】下列循环体执行的次数 int x=10, y=30; do{ y -= x; x++; }while(x++