题目内容：
由于角质层的屏障作用，全身吸收很少，药效发挥较慢，常用作局部治疗参考答案：
答案解析：
单选题：由于角质层的屏障作用，全身吸收很少，药效发挥较慢，常用作局部治疗
- 题目分类：药学专业知识(一)
- 题目类型：单选题
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