覆盖笔直的公路的天线应比覆盖弯曲幅度较大的公路的天的水平波瓣宽度小一些
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天线的吊装一般采用定滑轮，由三个人配合完成吊装
A. 对
B. 错
LTE的MIMO上行模式1*2表示基站发射1天线，手机接收2天线
A. 对
B. 错
MIMO能够获得比单入单出（SISO），单入多出（SIMO）和多入单出（MISO）更高的信道容量。
A. 对
B. 错
______she realized it was too late to leave.
A. No sooner it grew dark than
B. Hardly did it grow dark that
C. Scarcely had it grown dark than
D. It was not until dark that
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