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灌溉施肥

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什么是气体的质量比热和容积比热?

请说明煤层顶、底板构造。

关于绝对路径的使用,以下说法错误的是()

A. 绝对路径是指包括服务器规范在内的完全路径,通常使用http:// 来表示
B. 绝对路径不管源文件在什么位置都可以非常精确地找到
C. 如果希望链接其它站点上的内容,就必须使用绝对路径
D. 使用绝对路径的链接不能链接站点的文件,要链接站点文件只能使用相对路径

You are using Recovery Manager (RMAN) with a recovery catalog to back up your production database. The backups and the archived redo log files are copied to a tape drive on a daily basis. Because of media failure, you lost your production database completely along with the recovery catalog database. You want to recover the target database and make it functional. You could consider performing the following steps to accomplish this task: 1) Restore an autobackup of the server parameter file. 2) Restore the control file. 3) Start the target database Instance. 4) Mount the database. 5) Restore the data files. 6) Open the database with the RESETLOGS option. 7) Recover the data files. 8) Set DBID for the target database Which option illustrates the correct sequence that you must use?()

A. 8, 1, 3, 2, 4, 5, 7, 6
B. 1, 8, 3, 4, 2, 5, 7, 6
C. 1, 3, 4, 2, 8, 5, 6, 7
D. 1, 3, 2, 4, 6, 5, 7, 8

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