What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）

A.Effective even if ventilation is not shut down

B.Will not deteriorate in storage

C.Non-corrosive

D.Effective on electrical equipment

轻症、重症肺炎区别的重要依据是( )

A．肺部有固定的细湿啰音
B．呼吸困难的程度
C．发热，频咳
D．除呼吸系统表现外有其他系统受累的表现及全身中毒症状
E．白细胞增高