如图,点P是菱形ABCD对角线BD上一点,PE⊥AB于点E,PE=4,则点P到BC的距离等于( )
A:4
B:6
C:8
D:10
— Which of the two magazines will you buy?
— I will take _______. ______ are useless to me.
已知2a的平方根是±2,3是3a+b的立方根,求a﹣2b的值.