第1题：
The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channel
A．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal
第2题：
A、开箱(筒)频次
B、查询频次
C、发运频次
D、投递频次
第3题：
频次分为邮运频次 封发频次投递频次开箱频次邮件发运频次邮件交接频次 市内转趟频次
此题为判断题(对，错)。
第4题：
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of ______．
A.High frequency pulses
B.Combinations of high and low frequency pulses
C.The same frequency for all stations in a chain
D.Varied long and short pulses
第5题：
A.higher than the bus equency
B.lower than the bus equency
C.the same as the bus frequency but out of phase with it
D.same as the bus frequency and the circuit breaker may be closed at
第6题：
A、封发频次
B、市内转趟频次
C、收寄频次
D、时限频次
第7题：
此题为判断题(对，错)。
第8题：
pulse repetition frequency, PRF
第9题：
OFDM的英文是()
A.OverloadFrequencyDivisionMultiplexing
B.Orthogonal?Frequency?Division?Multiplexing
C.Overwhelming?Frequency?DivisionMultiplexing
D.Outstanding?Frequency?Division?Multiplexing
第10题：
频次分为( )。
A.邮运频次
B.封发频次
C.投递频次
D.开箱频次
E.邮件发 运频次
F.邮件交接频次
G.市内转趟频次