单选题 PQ is the diameter of the circle with center O (6,0) and the coordinates of polar P is (3, 2)Quantity A: the coordinate of point QQuantity B: (9,-2)

A、 Quantity A is greater.
B、 Quantity B is greater.
C、 The two quantities are equal.
D、 The relationship cannot be determined from the information given.

【正确答案】 C

【答案解析】O是PQ的中点，假设Q的坐标为(x，y)，那么(x+3)/2=6，(y+2)/2=0，因此x=9，y=-2，Q点坐标为(9，-2)，选择C。