从功能和组成角度，解释信息系统的概念。
手工电弧焊对焊条的工艺性能有哪些要求？
《典论•论文》批评了当时文坛上哪些不良现象？
关干职业锚的下列说法中，错误的是（）。 ["职业锚与能力、动机、价值观互动","职业锚在实践中选择、认识、强化","职业锚有助于职业定位","职业锚是不可能变化的"]
Your network contains an Active Directory domain. The functional level of the domain is Windows Server 2008. The domain contains application servers that run either Windows Server 2003，Windows Server 2008， or Windows Server 2008 R2. The network contains 5，000 client computers that run Windows XP Service Pack 3 （SP3）. Your company has a two-node failover cluster that runs Windows Server 2008 R2 Service Pack 1 （SP1）. As part of a Virtual Desktop Infrastructure （VDI）， the failover cluster hosts guest virtual machines （VMs） that run Windows 7. The company does not plan to purchase additional hardware for the existing servers. You need to recommend a solution to increase the number of VMs that can run on each host. What should you include in the recommendation？（） ["Microsoft Software Assurance","RemoteFX","mandatory profiles","folder redirection","RemoteApp","Microsoft System Center Configuration Manager 2007","Dynamic Memory","Dynamic Host Configuration Protocol （DHCP）","CPU Core Parking","pass-through disks","Microsoft System Center Virtual Machine Manager 2010","Microsoft Application Virtualization （App-V）","roaming profiles","Microsoft Enterprise Desktop Virtualization （MED-V）","VM snapshots","Windows Server Backu"]
试述氟喹诺酮类抗菌药的共同点、不良反应和临床应用
