单项选择题
A.铬 B.硒 C.钴 D.铝 E.镍
A.硒 B.硅 C.铜 D.钼 E.铬
A.＜0.001% B.＜0.01% C.0.001%～0.1% D.0.1%～1% E.＜1%
A.100mg／d B.350mg／d C.400mg／d D.500mg／d E.1000mg／d
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