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
Only under special circumtances ______ to surf online.
A. are freshmen permitted
B. freshmen are permitted
C. permitted are freshmen
D. are permitted freshmen
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