题目内容
命令tail -n3 /etc/passwd表示查看文件passwd的后[填空(1)]行内容。
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head默认显示文件头10行内容，显示行数可以更改，但最多不能超过10行。
more命令只能向前翻页，less命令既能向前翻页，又能向后翻页。
With about 3 million business enterprises using one or more forms of advertising, almost every American citizen __________ advertising every day. In the mid-1980s, U.S. companies invested __________ the mid-1980s, U.S. companies invested per person on advertising each year.______________________ in the U.S. has led many critics to attack it as a wasteful, unnecessary, unreliable, and annoying institution. Such critics usually argue that services promoted by it. However, though the supporters of advertising recognize some of these criticisms, they argue that by ________________ in purchasing commodities, advertising enables manufacturers and others to sell their products______________ , the increased volume of sales in turn enables companies to sell individual units at a lower price than if they were produced in small quantities.
8位输出电流型R/2R电阻网络D/A转换器的参考电压为5V，若数字输入为10011001，该转换器输出电压VO是多少？
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