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[单选题]30.信息系统的性能评价指标通常不包括
A可靠性
B安全性
C可扩展性
D可交互性
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1.
还处于起步阶段，只是作为职工基本医疗保险的补充的是 （ ）
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在下列8253的四种工作方式中，GATE 开始为低电平，8253 在写入方式字和计数初值以后，GATE引脚上加上一个正脉冲后开始工作，当计数初值减为0时，输出宽度为1个时钟周期的负脉冲，此时8253的工作方式设置为A.方式0 (计数结束中断)B.方式1 (硬件可重触发单稳态)C.方式4 (软件触发选通)D.方式5 (硬件触发选通)
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在消隐处理中,当进行平面可见性测试时,若平面的法线矢量和视线矢量的夹角大于90°,则该面()
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第四部分：填句补文（第26~30题,每题2分,共10分）下面的短文有5处空白, 短文后有6个句子, 其中5个取自短文, 请根据短文内容将其分别放回原有位置, 以恢复文章原貌, 并在答题卡相应位置上将答案选项涂黑。Lack of Sleep Is DangerousDoyou know that if you miss out too much sleep you will- die? It's true! If you stay awake for a long, long time, your brain and body will break down.The unofficial worldrecord forstaying awake is 11 days, and it's held by Randy Gardner. ___26 ___ He also had help from TV and radio reporters, a sleep researcher and a doctor.What happened? ___27 ___ Then his brain started to lose sense. On day 4, he thought a street sign was really a person. On day 6, he began to speak very slowly. On day 9, he couldn't finish sentences.On day 10, Randy thought he saw a forest in the next room. ___28 ___ Eventually, after he'd broken the world record, Randy was told to go to sleep. Experiments thatkeep peopleawake for dangerously long periods are always stopped before the patients break down.Rats, however, aren't so well cared for. ___29 ___ That's sooner thanif they'd been allowed to sleep but weregivenno food. They get really thin. But that's not because they stop eating- -quite the opposite. Even though these rats are eating food, their bodies can't process it in the normal way,Ontop of that, their little bodies lose more heat than normal, which makes them weak. This means that they need more food to stay at a healthy temperature. ___30 ___And that's what lack of sleep does for you.
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鸟类试图把所有的雏鸟喂活。一旦出现食物短缺，亲鸟会集中喂养部分雏鸟，而放弃对另一部分雏鸟的喂养。亲鸟的这种育雏方式体现了生物的 ( )
