[单选题]聚合物薄膜控释系统中，包衣膜hm，药物分子的扩散系数Dm，单位面积体外累积释放量Q，药物在聚合物膜中的溶解度Cp，时间t，若hm较大，Dm极低则（ ）。

正确答案 ：B

Q/t=CpDm/hm

[单选题]It took me a long time before I was able to fully appreciate what they __ for me.

正确答案 ：A

had done

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