阿摩線上測驗
19. What type of carbon environment does not generate a signal in the DEPT-90 spectrum and gives a positive peak in the DEPT-135 spectrum?
(A)methine
(B) methylene
(C) quaternary
(D)methyl
(E) carbonyl
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統計： A(0), B(0), C(3), D(5), E(0) #3840029
統計： A(0), B(0), C(3), D(5), E(0) #3840029
