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
