试述直接与空气形成爆炸性混合物的特性。
什么是物料需求计划（MRP）采购？
服务器选型的原则
我国社会主义初级阶段的阶级斗争是：（） 在一定范围内长期存在的阶级斗争。 无产阶级与资产阶级两大阶级对抗和斗争。 一种特殊形式的阶级斗争。 一种不完全形态的阶级斗争。 社会主义社会的主要矛盾。
You have an Exchange Server 2010 organization.You need to ensure that items in a user’s Inboxfolder that are older than 60 days are moved to a custom folder.What should you do first？（） Create a managed custom folder.Create a transport rule。 Create a new mail folder by using Microsoft Office Outlook.Create a journal rule。 Create a managed custom folder.Run the Managed Content Settings wizard from the Inbox managed default folder。 Create a new mail folder by using Microsoft Office Outlook.Run the Managed Content Settings wizard from the Inbox managed default folder。
A routing table contains static, RIP, and IGRP routes destined to the same network with each route set to its default administrative distance. Which route will be the preferred route?（）
