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【简答题】
摩尔吸收系数的物理意义是吸光物质在 浓度及 厚度时的吸光度。在给定条件下(单色光波长、溶剂、温度等),摩尔吸收系数是物质的特性常数。
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B.
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C.
was too expensive for every family to afford
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【单选题】How often did the writer phone her family?
A.
Every day.
B.
Every other week.
C.
Every week.
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