一旦具有该特性基团的化合物的相对含量发生变化，吸收系数必然相应变化，所以都存在“标准油”的选择问题。
Once the relative content of the compound with the characteristics of the group, changes, the absorption coefficient will surely change. Hence the problem of choice of standard oil has to be faced.
不同的消光观测资料说明，吸收系数对于波长、雪深以及入射辐射强度具有选择性。
Various extinction observations indicate that the absorption coefficient depends on the wavelength, snow depth and the incident radiation intensity.
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