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Galileo’s greatest glory was that in 1609 he was the first person to turn the newly invented telescope on the heavens to prove that the planets revolve around the sun rather than around the earth.

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Science moves forward ,they say, not so much through the insights of great men of genius as because of more ordinary things like improved techniques and tool.

阅读以下说明,回答问题1~4,将答案填入答题纸对应的解答栏内。 某公司的域名为xyz.edu.cn,所使用的网络地址为222.78.68.0/24,共有两台服务器,一台IP地址是222.78.68.10,名字是scrver1,它用作域名服务器、电子邮件服务器,另一台IP地址是222.78.68.11,名字是server2,它用作Web服务器。下面是服务器scrver1中的三个文件。 [/etc/named.conf文件的内容] options{ directory"/var/named"; }; }; zone"."IN{ type (1) ; file"named.ca"; }; zone"0.0.127.in-addr.arpa"IN{ type master; file"named.local"; allow-update{none;}; }; zone"xyz.edu.cn"IN{ type master; file"named.hosts"; allow-update{none;}; }; zone" (2) "IN{ type master; file"named.rev"; allow-update{none;}; }; [/var/named/named.hosts文件的内容] $TTL 86400 @IN SOA serverl.xyz.edu.cn. root.xyz.edu.cn.( 2001110600;serial 28800;refresh 14400;retry 3600000;expire 86400;minimum ) IN NS server1.xyz.edu.cn. IN MX 10 serverl.xyz.edu.cn. localhost. IN A 127.0.0.1 server1 IN A 222.78.68.10 server2 IN A 222.78.68.11 NW IN (3) [/var/named/named.rev文件的内容] $TTL 86400 @ IN SOA server1. xyz.edu.cn. root.xyz.edu.cn. ( 2001110600;serial 28800;refresh 14400;retry 3600000;expire 86400;minimum ) IN NS xyz.edu.cn. 10 IN (4) 11 IN PTR server2.xyz.edu.cn.

Who sees to tile safety of the supermarket

A. Thieves.
B. Shop assistant.
C. Detectives.

阅读以下说明,回答问题1-3。 在图书馆数据库有三个基本表:书目表Cata(书号Cno、书名Cname、作者Cauthor、出版年Cdate、价格Cprice)、学生表Student(学号Sno、姓名Sname、性别Sgender、专业Sdept)和借书历史表Borrow(所借书号Cno、借书者学号Sno、借书日期Bbdate、还书日期Brdate)。 [问题3] 请用SQL语句来实现如下改变:为借书历史Borrow增加一个属性罚金Bfine,同时删去书目表Cata中的属性价格Cprice。

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