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大容量的辅助存储器常采用RAID磁盘阵列。RAID的工业标准共有6级。其中 (48) 是镜像磁盘阵列，具有最高的安全性； (49) 是无独立校验盘的奇偶校验码磁盘阵列； (50) 是采用纠错海明码的磁盘阵列； (51) 则是无冗余也无校验的磁盘阵列，它采用了数据分块技术，具有最高的：I/O性能和磁盘空间利用率，比较容易管理，但没有容错能力。 48（）
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对长度为10的线性表进行冒泡排序，对坏情况下需要比较的次数为______
Footracing is a popular activity in the United States. It’s not only seen as a competitive sport, but also as a way to exercise, to enioy the comraderies (同专情谊) of like - minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time, or simply to enjoy the fun and exercise. People of all ages, from those less than one - year old (who may be pushed in strollers) to those in their 80s, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and are commonly 5 to 10 kilometers in length. The largest footrace in the world is the 1 2- kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific ocean. In 1993 there were 80,000 people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win, and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who wear costumes just for fun. In 1993 there was a group of men all of whom dressed up like Elvis Presley. There was a group of firefighters who were au tied in a long line and were carrying a firehouse. One year there was a bridal(新婚的)party in which the bride dressed in a long white gown and the groom wore a tuxedo(晚礼服). They threw flowers to bystanders, and were actually married at some point along the route. Which of the following best describes the organization of this passage
Footracing is a popular activity in the United States. It’s not only seen as a competitive sport, but also as a way to exercise, to enioy the comraderies (同专情谊) of like - minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time, or simply to enjoy the fun and exercise. People of all ages, from those less than one - year old (who may be pushed in strollers) to those in their 80s, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and are commonly 5 to 10 kilometers in length. The largest footrace in the world is the 1 2- kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific ocean. In 1993 there were 80,000 people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win, and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who wear costumes just for fun. In 1993 there was a group of men all of whom dressed up like Elvis Presley. There was a group of firefighters who were au tied in a long line and were carrying a firehouse. One year there was a bridal(新婚的)party in which the bride dressed in a long white gown and the groom wore a tuxedo(晚礼服). They threw flowers to bystanders, and were actually married at some point along the route. Which of the following are NOT included in the passage
When we see well, we do not think about our eyes very often. (79) It is only when we cannot see perfectly that we realize how important our eyes are. People who are nearsighted can only see things that are very close to their eyes. Everything else seems blurry(模糊的).Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant objects clearly. People who are farsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses, too. Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts(白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them. Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at an object out of one eye; then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes. People who suffer from astigmatism ______.
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