阿摩線上測驗
20. An NMR spectrometer that operates at a frequency of 60 MHz for 13C NMR spectra, operates at what frequency for 1 H NMR spectra?
(A)60 MHz
(B) 15 MHz
(C) 120 MHz
(D)240 MHz
(E) 30 MHz
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統計： A(0), B(1), C(0), D(6), E(0) #3840030
統計： A(0), B(1), C(0), D(6), E(0) #3840030
