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【单选题】
在药品检验中使用比吸收系数，简称吸收系数，其物理意义是
A.
当吸光物质溶液浓度为 1g ／ 100ml ，液层厚度为 1cm 时，在一定条件下的吸光度
B.
当吸光物质溶液浓度为 1mg ／ 100ml ，液层厚度为 1cm 时，在一定条件下的吸光度
C.
当吸光物质溶液浓度为 1mol ／ 100ml ，液层厚度为 1cm 时，在一定条件下的吸光度
D.
当吸光物质溶液浓度为 1mol ／ ml ，液层厚度为 1cm 时，在一定条件下的吸光度
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