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问题 填空题

三角形一条中位线所截成的新三角形与原三角形周长之和等于60cm，则原三角形周长为______cm．

答案

设新三角形的周长为x，则原三角形的周长为2x．

由题意得x+2x=60，

x=20．

原三角形周长为2×20=40（cm）．

故答案为40．

选择题

北京公交票价由2元变为1元，主要有利于[ ]

A、缓解交通压力，减少交通拥堵

B、扩大居民出行，方便居民外出旅游

C、降低城市中心人口密度

D、便于合理规划，加强城市管理。

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单项选择题

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.

A．power

B．rights

C．authorized

D．common
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