A:﹣2
B:0
C:53
D:1
如图,抛物线y=ax2+bx﹣3经过点A(2,﹣3),与x轴负半轴交于点B,与y轴交于点C,且OC=3OB.
你愿意为我捎个口信吗? (would like to do sth.)
____
一头牛的基本组成单位是( )
—Must he finish the work before lunch?
— ___________. He can do it in the afternoon.
按要求在每个图形中画一条线段.