A:Al
B:Mg
C:Zn
D:Fe
In those days, books were produced____ ____.
一个人想要获得较大成就,就必须做到( )
如图,在平面直角坐标系中,菱形OBCD的边OB在x轴正半轴上,反比例函数y=kx(x>0)的图象经过该菱形对角线的交点A,且与边BC交于点F.若点D的坐标为(6,8),则点F的坐标是____ .