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指出下列句中划线部分的词性To construct a reservior is an important government project.

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丙酮在已烷中的紫外吸收λmax为278nm,εmax为14.8,该吸收是由哪种跃迁引起的?( )

A. n-π*;
B. π-π*;
C. n-σ*;
D. σ-σ*。