A:but
B:thu
C:or
D:and
It's raining hard outside. Tell Betty the window.
若4x2•□=8x3y,则“□”中应填入的代数式是____ .
如图,在菱形ABCD中,对角线AC、BD相交于点O,E为BC的中点,则下列式子中,一定成立的是( )