共济失调毛细血管扩张症
A.4~12mgB.5~12mgC.10~20mgD.15~40mgE.50~120mg
参考答案:C
二次函数y=x2-2x+3图象的顶点坐标为 ______.
They need two_____for their rock band. [ ]
A. musicians
B. dancers
C. actors
D. swimmers