测量介质的吸收系数是通过测量介质的光谱透射率来实现的
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vary (Para. 1, Line 2): ______
A. be different
B. be similar
C. be acceptable
bend (Para. 1, Line 3): ______
A. stand
B. smile
C. bow
nuance (Para. 2, Line 5): ______
A. little
B. maximum
C. some
utmost (Para. 3, Line 11): ______
A. little
B. maximum
C. some