问题:
在△ABC中,三内角A、B、C成等差数列,则角B等于
[ ]
A.30°
B.60°
C.90°
D.120°
在△ABC中,三内角A、B、C成等差数列,则角B等于
B.60°
C.90°
D.120°
[ ]
A.30° B.60°
C.90°
D.120°
参考答案: