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[单选题]
操作系统文件管理的主要功能是______。(1分)
A
实现虚拟存储
B
实现按文件内容存储
C
实现文件的高速输入输出
D
实现按文件名存取
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试题答案：
D
答案解释：
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不少微机软件的安装程序都具有相同的文件名， Windows系统也如此，其安装程序的文件名一般为_____。
热门试题
1.
4.ethods of training animals have changed greatly in recent years. Zoo keepers have always had problems getting the animals to leave their cages in order for the cages to be cleaned, and also training them to move indoors when appropriate. Another problem was that many of the large animals became listless and bored. In the last twenty years, scientists have done research on dolphins and whales, training them to obey commands. The scientists found they could get animals to obey by rewarding them with food and affection when they responded correctly.Proper training allows the animals to receive the care they need. It was very difficult to get untrained animals, especially the larger ones, to stay still when they needed medical attention. Now they can be trained, on command, to remain still and even to allow blood samples to be taken and shots administered. All this is accomplished through positive reinforcement, without the use of any force. Affection training, as this process is called, has been used with great success on a wide variety of zoo animals. Animal behavior experts have taught zoo keepers to train bears, tigers, monkeys, and many other species to behave in a way that provides for better animal-keeper interaction. This training also keeps the animals from becoming bored and inactive.Although some people proclaim(谴责) that this training is inhumance and cruel to animals, results have shown that captive(猎获的)animals who previously were not doing well flourish under the new training procedures.(4分)4.1 The word “listless” means _______.(1分)A. countlessB. obedientC. inactive D. mysterious
2.
关于流水线效率的描述错误的是( )
3.
二、非选择题：41～46小题。共70分。
4.
建群种生活型相近而且群落外貌相似的植被型联合为 。
5.
QT间期延长见于（ ）
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