亚洲的地形特点是( )
函数y=kx+b(k、b为常数,k≠0)的图象如图,则关于x的不等式kx+b>0的解集为( )
如图,矩形纸片ABCD中,AB=6cm,BC=8cm,现将其沿AE对折,使得点B落在边AD上的点B1处,折痕与边BC交于点E,则CE的长为( )
Tom is ________ his pen, but he can't ________ it. Let's help him.