数组是指一组相同类型数据的集合，数组中的每个数据被称作元素。
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数组的最大索引值为“数组名.Length”。
A. 对
B. 错
方法的返回值类型均为void的。
A. 对
B. 错
将文本框内容转化换位double类型使用convert.Todouble（）
A. 对
B. 错
What does a DSC control unit do when a DSC message is received?
A. When receiving DSC messages other than a distress, urgency and safety call, the control unit is able to provide for an automatic transmission acknowledging the call received.
B. The information contained in the DSC message is decoded and displayed on the from panel.
C. The information may be stored in an internal memory.
D. All of the above.
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