纬度的变化规律是( )
A:从南向北逐渐增大
B:从东向西逐渐增大
C:从赤道向两极逐渐增大
D:从两极向赤道逐渐增大
A. doesn't B. didn't C. haven't D. hasn't
曲线y=12x2-2x在点1,-32处的切线的倾斜角为( ).