告警模块面板上↑按钮起什么作用（）
A.数值增加
B.退出到上级菜单
C.菜单循环
D.数值减少
参考答案：A, B
—Where are the tigers from?
—___________.[ ]
A. They are very big.
B. They are smart.
C. They are from China.
D. I like them very much.
数据字典是对数据流图中的数据流，加工、数据存储、数据的源和终点进行详细定义。（）
