单项选择题
A.小于6g／d B.6g／d C.大于6g／d，小于10g／d D.没有相关的参考值 E.越少越好
A.1200mg／d B.1500mg／d C.1800mg／d D.2000mg／d E.2200mg／d
A.38mg／d B.48mg／d C.58mg／d D.68mg／d E.78mg／d
A.1200mg／d B.1000mg／d C.800mg／d D.700mg／d E.600mg／d
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