如图所示, P 、 Q 为质量均为 m 的两个质点,分别置于地球表面上的不同纬度上,如果把地球看成一个均匀球体, P 、 Q 两质点随地球自转做匀速圆周运动,则下列说法正确的是( )
A.
P 、 Q 受地球引力大小相等
B.
P 、 Q 做圆周运动的向心力大小相等
C.
P 、 Q 做圆周运动的角速度大小相等
D.
P 受地球引力大于 Q 所受地球引力
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