鞍钢各选厂尾矿品位为（）。
A、16%以下
B、25%左右
C、35%左右
D、45%左右
参考答案：A
---Do you know___________ in Ya’an? --- On the 20th of April，2013.
A．how many people died in the earthquake
B．how many days the earthquake lasted
C．when the earthquake happened
D．when did the people die
如果说传统管理信息系统的核心是数据库，那么决策支持系统的核心是______。
