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当需要两个内容完全相同的图层时，可通过复制图层的方法实现，请问复制图层的方法有（） 单击“图层”菜单下的“复制图层”命令。 在图层面板上将相应图层拖动到“新建图层”按钮上。 在图层面板上对相应图层击右键执行“新建图层”命令。 在图层面板上双击相应图层。
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You are designing a Windows Azure application that will include two web roles. The web roles will communicate with on-premise development computers and on-premise databases. Web Role 1 must connect to development computers and databases. Web Role 2 must connect to only databases. What should you recommend？（） Create one endpoint group thatcontains the development computers and one endpoint group that contains the databases. Connect Web Role 1 to both endpoint groups. Connect Web Role 2 to only the database endpoint group.。 Create one endpoint group that contains the development computers and databases. Connect Web Role 1 and Web Role 2 to the endpoint group.。 Create one endpoint group that contains the development computers and one endpoint group that contains the databases. Connect the endpoint groups. Connect Web Role 1 and Web Role 2 to the development computer group.。 Create one endpoint group that contains the development computers and databases， and connect it to Web Role 1. Create one endpoint group that contains only the databases， and connect it to Web Role 2.。
在有毒气体检测领域缩略语PC-STEL指（）。
