XML是什么？（） ["可扩展的标记语言","是一套定义语义标记的规则","是一种元标记语言","是一种HTML语言"]
固氮作用
论述关系营销。
Your company is planning to deploy Windows 7. You have an image that is used to deploy Windows 7 on client computers. You need to add a volume image to the existing Windows image. What should you do？（） ["Service the image online.","Use DiskPart to attach a new volume.","Use ImageX to append the volume image.","Use the Deployment Image Servicing and Management （DISM） tool to mount the image."]
安装在压力容器上的安全阀应（）安装。 ["铅垂","水平","铅垂或水平","必须水平"]
需要
