下面关于加载的音频文件的参数设置对话框中，autostart的含义是指（）
A. 如果对应的值为“true”，则可以实现循环播放音乐的效果
B. 如果对应的值为“false”，则可以实现循环播放音乐的效果
C. 如果对应的值为“true”，则可以实现自动播放音乐的效果
D. 如果对应的值为“false”，则可以实现自动播放音乐的效果
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In what situation would the command ip helper-address be required？（Choose the best answer.）（）
A. Only when there is a duplicate IP address caused by a combination of static and dynamic IPaddress allocations
B. On each router that exists between the client and the server
C. Only when a router separates the client from the server
D. Only if the DHCP sever issues a DHCPNAK to the initial request
E. Only when the client is on the same subnet as the server
F. Only when the DHCP pool is out of IP addresses
中层之后，可以在属性面板中调整层的显示属性。其中表示层总是隐藏的选项是（）
A. default
B. inherit
C. visible
D. hidden
You are creating an undo buffer that stores data modifications.You need to ensure that the undo functionality undoes the most recent data modifications first.You also need to ensure that the undo buffer permits the storage of strings only.Which code segment should you use？（）
A. StackundoBuffer=new Stack（）；
B. Stack undoBuffer=new Stack（）；
C. Queue（）；
D. Queue undoBuffer=new Queue（）；
You create an ASP.NET page. The page uses the jQuery $.ajax function to make calls back to the server in several places. You add the following div element to the page. You need to implement a single error handler that will add error information from all page $.ajax calls to the div named errorInfo. What should you do？（）
Add the following options to each $.ajax function call：
B. Add the following code to the $（document）.ready function on the page：
C. Add the following option to each $.ajax function call：
D. Add the following code to the $（document）.ready function on the page：
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