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