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【单选题】
当绝缘介质一定，外加电压一定时，介质损耗电流IR的大小与介质损耗正切值tanδ成( )。A.
反比
B.
正比
C.
U形曲线比例关系
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举一反三
【判断题】Larger SNR makes it easier for the receiver to extract the transmitted signal from the background noise.
A.
正确
B.
错误
【简答题】In the DSSS, the spectrum of the transmitted signal is much wider than the spectrum associated with the （ ） rate
【判断题】If the bandwidth of transmitted signal is larger than the channel coherent bandwidth, part of the transmitted signal is truncated, which means nonlinearity is present and the signal could be severelyi...
A.
正确
B.
错误
【单选题】Computations show a reduction of 6dB in the EM field intensity with the distance doubled , and an increase of 3dB in the intensity with the transmitted power doubled. This result provides verification...
A.
that, with a 6dB reduction, the EM field intensity is twice as strong
B.
that the EM field intensity is decreased by 6dB as the range is doubled
C.
that, in the EM field, intensity with double distance leads to a 6dB reduction
D.
a 6dB intensity reduction causes a double distance in the EM field
【简答题】The main function of the receiver is to extract the input message signal from the degraded version of the transmitted signal coming from the channel.
【简答题】Translate the following sentences into Chinese. The main function of the receiver is to extract the input message signal from the degraded version of the transmitted signal coming from the channel.
【简答题】鲁尔区是德国最大的工业区，也是世界著名的工业区之一。据此完成题。 小题1:目前，在以下四种货物中，经莱茵河河运入该区且运量最大的是 A．煤炭 B．铁矿石 C．钢材 D．机械 小题2:新企业不愿落户综合整治前的鲁尔区是因为该区 A．劳动力工资水平高 B．用地紧张，环境污染严重 C．基础设施陈旧 D．通信服务落后 小题3:20世纪70年代，该区的钢铁工业也开始衰落，原因之一是 A．企业数量减少 B．水...
【单选题】Choose the word or phrase that is closest in meaning to the underlined part. Computations show a reduction of 6dB in the EM field intensity with the distance doubled , and an increase of 3dB in the in...
A.
that, with a 6dB reduction, the EM field intensity is twice as strong
B.
that the EM field intensity is decreased by 6dB as the range is doubled
C.
that, in the EM field, intensity with double distance leads to a 6dB reduction
D.
a 6dB intensity reduction causes a double distance in the EM field
【单选题】Larger ( ) makes it easier for the receiver to extract the transmitted signal from the background noise.
A.
BSS
B.
SNR
C.
BER
D.
SSID
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