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You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You write the following code segment. (Line numbers are included for reference only.) the TextBox control is data-bound to an instance of the Contact class. You need to ensure that the Contact class contains a business rule to ensure that the ContactName property is not empty or NULL. You also need to ensure that the TextBox control validates the input data. Which two actions should you perform?()
混凝土结构裂缝修补前应根据调查和检测结果确定裂缝修补方法。修补方法可分为()。
( )是完成某种作业所具备的心理、生理特征。
项目评估是由()组织进行的。
奥肯定律是经验规律。
电梯补偿链的作用是().
处女膜闭锁因为()
零点餐厅的特点有()
眼眶非特异性炎症的CT表现不包括()
对于正偏态分布的资料,M与 的关系为()。