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34. If the signal-to-noise ratio for a recorded spectrum is 5, what is the signal-to-noise ratio for the average of 16 spectra recorded in the same manner?
(A) 4
(B) 5
(C) 20
(D) 40
(E) 80


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難度: 計算中

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34. If the signal-to-noise ratio for a ..-阿摩線上測驗