题目：
中药周围水蒸气的密度和压力小于空气中水气压力时产生的现象为（）
A.平衡水分
B.安全水分
C.吸湿现象
D.风化现象
E.软化现象
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
中药周围水蒸气的密度和压力小于空气中水气压力时产生的现象为（） A.平衡水分 B.安
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