当浮选池发生死池现象时，应检查（）
A.进水阀
B.进气阀
C.释放器
D.进气阀与释放器
参考答案：D
— The Coca-Cola company is one of the of the match.
— No wonder there are many Coca-Cola pictures around the sports field.
A．players
B．visitors
C．sponsors
D．judges
简述情事变更原则的适用条件
