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64. Which is the order of increasing δ values downfield from TMS for the methyl groups shown (lowest first)?
 
(A)I, III, IV, II
(B) II, I, III, IV
(C) IV, II, III, I
(D)III, IV, II, I

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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64. Which is the order of increasing δ v..-阿摩線上測驗