A:a带负电荷
B:a带正电荷
C:b带正电荷
D:c带正电荷
I will ask the Minister ____ (go) and see it.
二次函数y=ax2+bx+1(a≠0)的图象的顶点在第一象限,且过点(﹣1,0).设t=a+b+1,则t值的变化范围是( )
This kind of sweater is too ____. I want to buy a cheap one.