A:新制饱和氯水中:Al3+、Cu2+、SO42-、Br-
B:使甲基橙变红的溶液中:Mg2+、Fe3+、NO3-、SCN-
C: =1×10-13mol·L-1的溶液中:Na+、K+、C1-、AlO2-
D:由水电离的c(H+)=1×10-13mol·L-1的溶液中:Ca2+、Ba2+、Cl-、HCO3-
--- Oh, my god. I ______ 2 kg. this month.
--- Don't worry. It's normal for a growing teenage girl.
—Can you come to my party on Tuesday evening?
—_______ But I'm busy studying for my test.
已知函数y=2x+b经过点A(2,1),将其图象绕着A点旋转一定角度,使得旋转后的函数图象经过点B(﹣2,7).则①b=____;②旋转后的直线解析式为____.