LINUX中的超级用户为root，登陆时不需要口令。

[单选题]Passage2People often complained about not getting"a good night's sleep"，but sleep patterns differ from person to person. Most adults require six to eight hours of sleep to function well，while others survive on only a few hours. Still，most people today think of sleep as one continuous period of downtime. This is not the way people used to sleep. According to researchers in earlier times，people divided sleep by first sleep a few hours，waking up，then going back to sleep.Before the 18th century，people had no gas or electricity in their homes. Fire，candles，or oil lamps were the common forms of lighting. This lack of artificial lighting in homes contributed to people's sleep patterns. It made sense for people to go to bed early. If you live in this time period，you might be a hard-working farmer，and you would come home，eat and quickly fall into bed exhausted. You would probably go to sleep at 9：00 or 10：00 P.M. In this first period of sleep-called first sleep-you would typically sleep until midnight or shortly afterwards.Halfway through the night during a period some call the watch，or watching period. When you came out of first sleep，you would stay in bed and relax quietly. You might talk with a bedfellow，meditate on the day's events or the meaning of a dream，or just let your mind wander. If you enjoyed writing or drawing，you might get out of bed to write a poem or story or draw a picture.Then you would start to feel sleepy, so would return to bed and fall asleep again for your second sleep. This period would continue until early morning when daylight arrived. Again, with no artificial lighting in homes, people naturally woke up early to take advantage of sunlight.Today, human may consider divided sleep a strange habit, but sleep researchers say that it is actually a more natural sleep pattern. Dr. Thomas Wehr of the U.S. National Institute of Mental Health has studied human sleep. He thinks that modern sleep problems occur because the orderly, natural way of sleep is breaking through the more recent continuous sleep pattern. Wehr and other scientists believe that artificial lighting has altered the way people sleep. In a research study, he asked 15 adults to rest and sleep in darkness for 14 hours(from 6:00 P.M. to 8:00 A.M.). At first, the subjects took a few hours to get to sleep, and then slept 11 hours a night. Then overtime, they switched to divided sleep. They fell asleep for about 3 or 5 hours in the evening, stay awake for an hour of two and then slept again for four hours till early morning.Unlike the people in the study, we modern humans generally do not practice divided sleep. However, many of us have the experience of waking up in the middle of the night. We usually consider this a sleeping "problem", but perhaps we should look at it as natural behavior. Divided sleep may be the way we should all be sleeping. A first sleep followed by a relation period and a second period of sleep could help all of us to beat the stress of our fast-paced lives.What is the main idea of the text?

[单选题]整个制冷系统中，制冷设备包括（）。

[单选题]笔迹检验就是研究如何通过文字符号的书写动作习惯特点、文字布局习惯特点、书面语言习惯特点，来认定书写人的一项物证检验专门技术方法。上面一段文字主要告诉我们（　　）。

[问答题]7号信号网的部件由哪三部分组成？

[填空题]护背距离不得大于（）。

[判断题]排球比赛时，某队教练员在一局中第三次请求暂停时，第二裁判员应当对教练员进行警告并出示黄牌

[单选题]PowerPoint 2000/2003中提供了（）视图方式。

[多选题]按照《审计法》的规定,我国审计监督的原则有:

[单选题]低渗性脱水时血清钠含量应是（）

[单选题]男性，23岁。骑车时摔倒，头部着地1小时。现主诉头痛、恶心，并有意识障碍。首先应做的检查是（）.

[判断题]LINUX中的超级用户为root，登陆时不需要口令。

[单选题]在linux系统下，忘记了root密码，可以到（）模式下修改找回root密码。

[判断题]每个UNIX/Linux系统中都只有一个特权用户，就是root帐号。

[单选题]UNIX/Linux系统中，下列命令可以将普通帐号变为root帐号的是（）。

[判断题]每个UNIX/Linux系统中都只有一个特权用户，就是root帐号。

[单选题]UNIX／Linux系统中，下列命令可以将普通帐号变为root帐号的是（）。

[单选题]在linux中，超级用户root的主目录是（）目录。

[填空题]拥有管理员root权限的用户在字符界面下重启Linux的命令有两个，分别是（）和（）。

[单选题]在Linux中，当root密码丢失后，应该：（）

[单选题]Linux系统里，想要禁止root远程登陆，需要修改（）文件，然后重启服务。