【单选题】【消耗次数：1】
对于正常发育的儿童、青少年其体内摄入氮与排出氮的关系(? )。
①
I＝(U+F+S)
②
I＞(U+F+S)
③
I＜(U+F+S)
④
正相关
⑤
负相关
参考答案：
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