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【单选题】
检查某药物中的重金属，称取供试品2.0g，依法检查，与标准铅溶液(每1ml相当10μg的Pb)2ml用同法制成的对照液比较，不得更深。重金属的限量是A.
0.0001
B.
5e-005
C.
2e-005
D.
1e-005
E.
5e-006
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