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【多选题】
药物杂质的来源主要从()。A.
贮藏过程中引入
B.
运输过程中引人
C.
生产过程中引入
D.
销售过程中引入
E.
以上都是
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A.
An accumulation of PCBs in the human body is the direct reason of the cancer and other severe disorders.
B.
PCBs can't be disintegrated using conventional waste-treatment ways.
C.
PCBs are degraded by natural processes very slowly.
D.
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【简答题】出生后发育最为迅速的阶段为（）
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