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为什么通过科学献血可以降低癌症的发病率？

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你的领导事事亲力亲为，没有给你分配工作，让你无所适从，你怎么处理这件事？

You are the administrator of a SQL Server 2000 computer. You have two new hard disks on which you will create a database named inventory. You want to insert, update, and delete data as quickly as possible.
Which two actions should you take？ (Each correct answer presents parts of the solution. Choose two)

A. Configure the hard disks as two mirrored NTFS volumes.
B. Configure the hard disks as one mirrored NTFS volumes.
Configure the hard disks as two independent NTFS volumes.
D. Configure the hard disks as one extended NTFS volume.
E. Place inventory_data.mdf on the first volume and inventory_log.ldf on the second volume.
F. Place inventory_data.mdf on the first volume and inventory_data2.ndf and inventory_log.ldf on the second volume.
G. Place inventory_data.mdf and inventory_log.ldf on the same volume.

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如何正确理解病人在医院输血时缴纳的“血费”？(为什么献血是无偿的？用血即要钱？)

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为什么经常献血可提高造血功能？

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