—That's right._________.
A:Something is better than nothing
B:Many hands make light work
C:It never rains but pours
D:The early bird catches the worm
求:
在△ABC中,若acosA+bcosB=ccosC,则△ABC的形状是什么?
视觉的形成过程中,图象和视觉的形成部位分别是( )