氨基酸能否充分利用于蛋白质合成，取决于（）。

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【单选题】【消耗次数：1】

① 热卡是否足够

② 氨基酸的补充是否足够

③ 是否同时补充葡萄糖

④ 人体内是否需要蛋白质

⑤ 合理的热卡/氮比值

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