单项选择题
A.fixed size
B.differencing
C.dynamically expanding
D.linked to a physical hard disk
单项选择题 设一个关系A具有a1个属性和a2个元组,关系B具有b1个属性和b2个元组,则关系AB具有()个元组。
多项选择题 在Photoshop中选择“编辑”>“预置”>“显示和光标”,弹出对话框,对话框中的“绘画光标”下面有三个选项,可控制绘画工具(PaintingTools)的光标显示,请问,当选择“精确”选项时,下列哪组工具将会以十字线形式显示?()
单项选择题 You have an Exchange Server 2010 Hub Transport server named Hub1. You install an application on a third-party server named Server1. You discover that the application cannot authenticate to remote servers. You need to ensure that the application can relay e-mail messages by using Hub1. What should you do?()