频谱监测的目的是为()提供技术支持。
A.频谱管理
B.频率指配
C.频率规划
D.以上三条均是
参考答案:D
At the age of 29, Dave was a worker, ________ in a small apartment near Boston and ________ what to do about his future. (2009湖南卷)
A.living; wondering
B.lived; wondering
C.lived; wondered
D.living; wondered
在Windows98中MIDI是以特定格式存储图象的文件类型。