2. 外语
  3. In a rectangular coordinate system, the set of all points (x, y) such that x2+y2＜1 comprises

In a rectangular coordinate system, the set of all points (x, y) such that x2+y2＜1 comprises

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问题 In a rectangular coordinate system, the set of all points (x, y) such that x2+y2＜1 comprises
选项 A、a triangular region
B、two parallel line segments
C、a circular region
D、a rectangle region
E、a square region
答案C
解析 x2+y2=1刚好是以圆点为圆心，半径为1的圆的方程，x2+y2＜1表示的是圆内所有点的集合，所以选择C。
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