(about plane rectangular coordinate system) On the problem of plane rectangular coordinate system The following statement is true: A point that doesn't belong to any quadrant is not on the axis, it's at the origin B the abscissa and ordinate are exchanged to represent another point The point with negative abscissa of C is in quadrant two or three The point whose D ordinate is less than 0 must be below the x-axis But I think B is wrong. It should be d,

D is right. A is wrong because the origin is also on the coordinate axis. B is wrong because it doesn't necessarily change to another point after changing. C is wrong because the point whose abscissa is negative is not necessarily on the second or third quadrant, but also on the coordinate axis

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