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以下不属于详细调查难点的是（）
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We are all busy（31） about and using the Internet, but how many of us know the history of the Internet?Many people are（32） when they find that the Internet was set up in the 1960s. At that time, computers were large and expensive. Computer networks didn't work well. If one computer in the network broke down, then the whole network stopped. So a new network system had to be set up. It should be（33） to be used by many different computers. If part of the network was not working, information could be sent through（34） part. In this way computer network system would （35） on working all the time. （36） the Internet was only used by the government, but in the early 1970s, universities, hospitals and banks were allowed （37） it, too. However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became cheaper and easier to use. Scientists had also developed software（软件）（38） made "surfing" the Internet more convenient.Today it is （39） to get on-line and it is said that millions of people use the Internet every day. Sending e-mail is more and more popular （40） students. The Internet has now become one of the most important parts of people's life. 35（）
子系统测试又称分调，是在（）测试的基础上进行的。
有一个关系模式“学生”，其中包含的属性有：学号、姓名、性别、年龄、班级号。其中“班级号”是（）
铣削时铣削力在进给方向上的分力与工件进给方向相反的铣削方式称（）
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