A:汉武帝有削藩过度之嫌
B:分封制有利于加强中央集权
C:太宗时期实现安平四方
D:外戚专权导致朝野叛乱
偶函数f(x)满足f(x-1)=f(x+1),当x∈0,1时, f(x)=1-x,则关于x的方程fx=(19)x在x∈0,3上解的个数是( )
There are _____months in a year. _____ month is December.