Most computer systems are (26) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (27) to an outsider attack by preventing (28) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (29) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (30) by tools referred to as Intrusion Detection Systems.

A．reliable

B．secure

C．indestructible

D．steady

及时冷水冲洗创面的优点包括（）

A.迅速降温、防止继续损伤

B.清洁创面

C.有利于消肿

D.减轻疼痛

E.以上都不是