单项选择题
A.铅 B.镉 C.汞 D.砷 E.铜
A.19% B.22% C.30% D.41% E.50%
A.40g B.30g C.20g D.10g E.5g
A.肝脏 B.胃 C.肾脏 D.唾液腺 E.小肠
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