[问答题] 简述物料需求计划的概念。

You have an Exchange Server 2010 Mailbox server.The server contains one mailbox database.You need to view the last logon time of all users in the organization.What should you do？（） ["From the Exchange Management Shell， run Get-MailboxDatabase.","From the Exchange Management Shell， run Get-MailboxStatistics.","From the Exchange Management Console， create and export a filter.","From the Exchange Management Console， run the Remote Connectivity Analyzer."] 体现了以客户需求为导向，消除生产经营过程中一切无效的劳动和资源的管理思想是（） ["CIMS","ERP","JIT","MRPⅡ"] 请简述ERP的四个全景及其对应的全景管理。 You have an Exchange Server 2010 Mailbox server.You need to identify which users have the largest mailboxes on the server.What should you do？（） ["Run the Get-MailBoxStatistics cmdlet.","Run the Get-StoreUsageStatistics cmdlet.","Add the MSExchangeIS Client performance counters to the Performance Monitor.","Add the MSExchangeIS Mailbox performance counters to the Performance Monitor."] 诈病的特点？ 简述物料需求计划的概念。