A:染色体
B:液泡
C:核糖体
D:叶绿体
圆锥的底面半径是10cm,高是2cm.
①这个圆锥的底面周长是____;
②这个圆锥的底面积是____ cm2 ;
③这个圆锥的体积是____ cm3
How many people died in the Bund tragedy in Shanghai on Dec. 31, 2014?
有“黄金水道”和“地上河”之称的两条河是指( )