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【单选题】
一般药物有效期是（）
A.
药物的含量降解为原含量的50%所需要的时间
B.
药物的含量降解为原含量的70%所需要的时间
C.
药物的含量降解为原含量的80%所需要的时间
D.
药物的含量降解为原含量的90%所需要的时间
E.
药物的含量降解为原含量的95%所需要的时间
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