观测时段
参考答案：
测站上开始接收卫星信号到观测停止，连续工作的时间段，称为观测时段，简称时段。
—Where would you like to ?
—I'd like to go somewhere exciting. [ ]
A. go on vacation
B. go on a vacation
C. for a vacation
D. for vacation
802.11a的最大传输速率为（）。
A.1Mbps
B.11Mbps
C.54Mbps
D.100Mbps
