北宋军队“兵不识将,将不识兵”现象的产生,其根本原因是北宋统治者为了( )
A:防止武将专权
B:强干弱枝
C:加强禁军
D:使其互相牵制
Either you or I ______ going there tomorrow.
China is a country ____ ____ ____ ____ 5,000 years.
已知2a=3b=m,ab≠0且a,ab,b成等差数列,则m=( )