按照迈克尔・波特的划分，以下哪一种不属于竞争战略？（） ["总成本领先战略","差别化战略","纵向一体化战略","重点战略"]
All client computers in your company run Windows 7 Enterprise. Each client computer runs one guest virtual machine (VM) in Windows Virtual PC . A user reports that a supported USB device connected to his client computer does not appear in the guest VM. The USB device functions correctly on the client computer. You need to ensure that the USB device can be installed in the guest VM. What should you do？（） ["Use Virtual PC Manager to attach the USB device on the host.","Run the Add Hardware Wizard in the guest.","Use the Computer Management console to scan for hardware changes in the guest.","Use the Computer Management console to update the USB Virtualization Bus driver on the host."]
哥特式建筑的主要特征是什么？举例说明。
简述人格中的自我调控系统
产品结构子系统是生产管理的基础，是运行（）、（）、（）的基础。
简述电子商务网站评价的内容。
