“府有四出门，随时听事……国每有大议，天子车驾亲幸其殿，丞相所请，靡有不听……”此现象出现在（）。 西汉初期。 西汉武帝以后。 北宋初期。 明朝初期。
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a composite user control that includes a TextBox control named txtInput. The user control will be hosted in a window and will have handlers for the text-changed event of txtInput. You need to ensure that the application meets the following requirements: AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true); Which of the following statments are TRUE ?（） A text-changed event handler, named Audit_TextChanged, was Created for the txtInput control.。 Audit_TextChanged will stop running because the event is marked as handled by certain event handlers.。 Even through the event is marked handled by certain event handlers, Audit_TextChanged will still run.。 Audit_TextChanged will continue to run until the event is marked as handled.。
下列哪一项是安全教育应有的特点？（） 长期性和短期性。 阶段性和成果性。 容易性与简单性。 专业性和科学性。
电枢绕组短路故障必须使用（）进行检测。 电枢感应仪。 故障检测仪。 示波器。
关键期的存在说明学生心理发展具有（） 阶段性。 顺序性。 不平衡性。 差异性。
抽堵盲板时煤气压力要求：（）
