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尿负荷试验是评价水溶性维生素营养状况常用的指标 口服负荷剂量维生素C后4小时尿中维生素C排出量为多少即是维生素C缺乏（）A.
<3mg< /div>
B.
<5mg< /div>
C.
<10mg< /div>
D.
<15mg< /div>
E.
<20mg< /div>
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