76.下圖為甲狀腺素的結構通式,X為下列何者?
(A)NH
(B)O
(C)S
(D)C=O
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統計: A(1124), B(5271), C(970), D(805), E(0) #2180410
統計: A(1124), B(5271), C(970), D(805), E(0) #2180410
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#5820859
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