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用光度法测定六价铬时，加入磷酸的主要作用是什么？

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真皮中的纤维结缔组织有胶原纤维、弹力纤维和（）。

（）一般用来车削轴类工件的外圆，端面和右向台阶。

A. 45°车刀
B. 75°车刀
C. 90°右偏刀
D. 任意

You work as an Exchange Administrator for Xxx .The company has a Windows 2008 Active Directorybased network.You have just finished deploying an Exchange 2010 server and migrating all mailboxes including resource mailboxes from Exchange Server 2003. After the migration from the Exchange 2003 server was complete， you noticed that the resource mailboxes were showing up as a shared mailbox and not a resource mailbox.You realize that you need to convert them to Exchange 2010 resource mailboxes.While logged into the Exchange Management Console， you do not see any option to convert a mailbox.What should you use to convert this Exchange 2010 shared mailbox to an Exchange 2010 resource mailbox？（）

A. Exchange Troubleshooting Assistant
B. Exchange System Manager
C. Exchange Management Shell
D. Command prompt

值班员兼信息统计员还要负责将暂存物品按（）分类，分别放置在相应的柜层中，以备以后旅客提取暂存物品时方便查找。

A. 种类
B. 数量
C. 用途
D. 日期