信噪比（signal to noise ratio,SNR）是MRI最基本的质量参数，其正确的概念表述应为（）
According to Shannon's equation, what is the channel capacity of an analog voice-grade phone line with a bandwidth of 3100 Hz and a signal-to-noise ratio or 30 dB?A．9.1 KbpsB．9.3 KbpsC．30.9 KbpsD．30.17 Kbps
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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 channelA．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal
信噪比是A、NEQB、DQEC、RMSD、ROCE、SNR
信噪比(signal to noise ratio,SNR)是MRI最基本的质量参数，其正确的概念表述应为：()。A、图像的亮度与暗度之比B、两个像素的信号强度之比C、两个体素的信号强度之比D、图像的信号强度与背景强度之比E、图像的T1值与背景噪声T1值之比
What is an advantage of an externally modulated laser over a directly modulated laser?()A. lower costB. higher chirpC. easier to manufactureD. higher dispersion toleranceE. higher optical signal-to-noise ratio
You are the Cisco Network Designer in Cisco.com. Which signal and noise values will result in the best phone communication with an access point?()A. signal strength 5dBmB. signal strength 6dBmC. noise level 4dBmD. noise level 5dBm
什么是RSRP?()A.The received power on the resource elements that carry cell-specific reference signalsB.wideband powerC.N times the Reference Signal Received Power divided by the total received power in the channel bandwidthD.Signal to Interference plus Noise Ratio
