题目内容
避免死锁的一个著名的算法是 (15) 。
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在下面列出的数据模型中， (14) 是概念数据模型。
The appeal of the world of work is first its freedom. The child is compelled to go to school; he is under the 1 of authority. Even what he 2 to school may be decided for him. As he grows up,he sees 3 it is to be free 4 school and to be able to choose his job and change it if he doesn’’t like it,to have money in his pocket and 5 to come and go as he wishes in the world. The boys and girls, a year or two older than he is, whom he has long observed, revisit school utterly 6 and apparently mature. Suddenly masters and mistresses seem 7 out of date as his parents and the authority of school a 8 thing. At the moment the adult world may appear so much more real than the school world 9 the hunger to enter it cannot be appeased by exercises in school books, or talk of 10 examinations necessary for entry into professions or the more attractive occupations. This may not be the wisest 11 but it is a necessary part of growing up, for everyone must come sooner or later to the 12 of saying" Really, I’’ve had enough of being taught; I must do a proper job. "Some youths, maturing rapidly because of outside influences,come to this decision 13 than they ought. Yet in a way this is not a bad frame of mind to be in 14 leaving school. At work, the young man makes one of the first great acceptances of life-he accepts the 15 of the material or the process he is working with. The job must be done in accord with some rigid process he cannot 16 . He sees the point of it and in doing so comes to 17 with life. Nothing done in school 18 its will in quite the same way;if it is wet games can be cancelled;if the math master is ill one can 19 with something else. But even the boy delivering papers, like the driver taking out his bus, discovers that one cannot 20 because there is snow on the ground, or the foreman is irritable, or he himself is in a bad mood that morning. The appeal of the world of work is first its freedom. The child is compelled to go to school; he is under the 1 of authority. Even what he 2 to school may be decided for him. As he grows up,he sees 3 it is to be free 4 school and to be able to choose his job and change it if he doesn’’t like it,to have money in his pocket and 5 to come and go as he wishes in the world. The boys and girls, a year or two older than he is, whom he has long observed, revisit school utterly 6 and apparently mature. Suddenly masters and mistresses seem 7 out of date as his parents and the authority of school a 8 thing. At the moment the adult world may appear so much more real than the school world 9 the hunger to enter it cannot be appeased by exercises in school books, or talk of 10 examinations necessary for entry into professions or the more attractive occupations. This may not be the wisest 11 but it is a necessary part of growing up, for everyone must come sooner or later to the 12 of saying" Really, I’’ve had enough of being taught; I must do a proper job. "Some youths, maturing rapidly because of outside influences,come to this decision 13 than they ought. Yet in a way this is not a bad frame of mind to be in 14 leaving school. At work, the young man makes one of the first great acceptances of life-he accepts the 15 of the material or the process he is working with. The job must be done in accord with some rigid process he cannot 16 . He sees the point of it and in doing so comes to 17 with life. Nothing done in school 18 its will in quite the same way;if it is wet games can be cancelled;if the math master is ill one can 19 with something else. But even the boy delivering papers, like the driver taking out his bus, discovers that one cannot 20 because there is snow on the ground, or the foreman is irritable, or he himself is in a bad mood that morning.
局域网的网络软件主要包括网络数据库管理系统、网络应用软件和 (13) 。
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