下列构象中最稳定的是 ()-|||-H CH3-|||-H3C H-|||-A-|||-H H-|||-H H-|||-H CH3-|||-H H-|||-B-|||-H H-|||-CH3 H-|||-H H-|||-H3C H-|||-C CH3-|||-H-|||-H H-|||-D 无正确答案

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