Most computer systems are (165) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (166) to an outsider attack by preventing (167) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (168) 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 (169) by tools referred to as Intrusion Detection Systems.

（167）处是（）

A.visit

B.access

C.I/O

D.read/write

下面关于劳动保护用品的叙述中，不正确的是（）。

A、使用劳动保护用品，通过采取隔离、封闭、吸收、分散、悬浮等措施，能起到保护机体的局部或全部避免外来侵害的作用

B、在一定条件下，使用个人防护用品是最优的防护措施

C、防护用品严格保证质量，安全可靠

D、防护用品穿戴要舒适方便，经济耐用