（） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air...

第1题

[单选题] Which one of following statement is not true concerning the suitable sites of the direct acting relief valve and the pilot operated relieve valve?（）

A、the direct acting relief valve is used for controlling lower flows and pressure B、the pilot operated relief valve is used for controlling higher flows and pressure C、the pilot operated relief valve is used for controlling lower flows and pressure D、the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve

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第2题

[单选题] The control mode where the position of the final control element has a linear relationship with the position or value of the controller, variable is known as（）

A、two position control B、proportion control C、reset control D、rate control

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第3题

[单选题] Network equipment supporting the use of flow control mechanisms has been recently installed. What is the purpose of flow control in a data network?（）

A、It ensures that data is retransmitted if an acknowledgment is not received. B、It reassembles segments in the correct order on the destination device. C、It provides a mechanism for the receiver to control the transmission speed. D、It regulates the size of each datagram segment. E、All of the above are functions of flow control

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第4题

[单选题] You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a ListBox control to the application. The ListBox control is data-bound to an instance of a custom collection class of the Product objects named ProductList. The number of items of the data-bound collection is fixed. However, users can modify the properties of each of the Product objects in the collection. You need to ensure that changes made on the Product objects are automatically reflected in the ListBox control. What should you do?（）

A、Implement the INotifyPropertyChanged interface in the Product class. B、Implement the INotifyCollectionChanged interface in the ProductList class. C、Set the Mode property of the Binding object of the ListBox control to TwoWay. D、 Set the UpdateSourceTrigger property of the Binding object of the ListBox control to PropertyChanged.

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第5题

[单选题] The value of the controlled variable, which under any fixed set of conditions the automatic controller operates to maintain, is known as （）

A、set point B、control point C、deviation D、offset

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第6题

[] Which kind of the following controllers is the most sophisticated controller?（）

A、A.Proportional controller B、B.Integral controller C、C.Derivative controller D、D.PID controller

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第7题

[多选题] You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience. The custom user control uses two TextBox controls and two Button controls. You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform? （）

A、Add the OnClick event handler for the Login button to the code used in the custom user control. B、Add the OnClick event handler for the Login button to the code used in the Web Form where the control is added. C、In the Page_Load method of the Web Form, add a code segment to set the visibility of the TextBox and Button controls where the control is added. D、In the Page_Load method of the custom user control, add a code segment to set the visibility of the TextBox and Button controls.

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第8题

[多选题] You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience. The custom user control uses two TextBox controls and two Button controls. You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform?（）

A、Add the OnClick event handler for the Login button to the code used in the custom user control. B、Add the OnClick event handler for the Login button to the code used in the Web Form where the control is added. C、In the Page_Load method of the Web Form, add a code segment to set the visibility of the TextBox and Button controls where the control is added. D、In the Page_Load method of the custom user control, add a code segment to set the visibility of the TextBox and Button controls.

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第9题

[多选题] You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience.The custom user control uses two TextBox controls and two Button controls.You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform?（）

A、Add the OnClick event handler for the Login button to the code used in the custom user control. B、Add the OnClick event handler for the Login button to the code used in the Web Form where the control is added. C、In the Page_Load method of the Web Form, add a code segment to set the visibility of the TextBox and Button controls where the control is added. D、In the Page_Load method of the custom user control, add a code segment to set the visibility of the TextBox and Button controls.

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第10题

[多选题] You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience. The custom user control uses two TextBox controls and two Button controls. You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform? （）

A、Add the OnClick event handler for the Login button to the code used in the custom user control. B、Add the OnClick event handler for the Login button to the code used in the Web Form where the control is added. C、In the Page_Load method of the Web Form, add a code segment to set the visibility of the TextBox and Button controls where the control is added. D、In the Page_Load method of the custom user control, add a code segment to set the visibility of the TextBox and Button controls.

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（） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.

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