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发布频次（Frequency）
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更多 “发布频次（Frequency）” 相关考题
考题
The maximum data rate of any single wireless link can be described by the shannons theorem which is related to the（）in hertz，and the（）on the channelA．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal
考题
You are attempting to parallel two AC.generators, and the synchroscope pointer revolving in the fast direction.This indicates that the frequency of the incoming machine is
A.higher than the bus equencyB.lower than the bus equencyC.the same as the bus frequency but out of phase with itD.same as the bus frequency and the circuit breaker may be closed at
考题
OFDM的英文是()A.OverloadFrequencyDivisionMultiplexingB.Orthogonal?Frequency?Division?MultiplexingC.Overwhelming?Frequency?DivisionMultiplexingD.Outstanding?Frequency?Division?Multiplexing
考题
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of ______．A.High frequency pulsesB.Combinations of high and low frequency pulsesC.The same frequency for all stations in a chainD.Varied long and short pulses
考题
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A对B错
考题
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
考题
FDM的英文是（）A、Overload Frequency Division Multiplexing B、Orthogonal Frequency Division Multiplexing C、Overwhelming Frequency Division Multiplexing D、Outstanding Frequency Division Multiplexing
考题
OFDM的英文全称是（）A、Orthogonal Frequency
Division MultiplexingB、Outstanding Frequency
Division MultiplexingC、Overwhelming Frequency
Division MultiplexingD、Orthogonal Frequency
Division Modulation
考题
单选题The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of（）.A
High frequency pulsesB
Combinations of high and low frequency pulsesC
The same frequency for all stations in a chainD
Varied long and short pulses
考题
单选题When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）A
After determining that the frequency or channel appears to be no longer in useB
After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsC
After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedD
Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
考题
单选题When it is accepted to remain on the frequency indicated，you should say（）.A
Standing by on VHF frequencyB
Coming to VHF frequencyC
VHF frequency. is the best place for you to stay byD
remaining in frequency. and do not change
考题
判断题Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A
对B
错
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