单项选择题
A.38mg/d B.48mg/d C.58mg/d D.68mg/d E.78mg/d
A.16.5mg/d B.11.5mg/d C.15.5mg/d D.13.5mg/d E.21.5mg/d
A.钼 B.硒 C.铜 D.锰 E.铬
A.25mg/d B.10mg/d C.20mg/d D.15mg/d E.30mg/d
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