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【单选题】
引起地基中的附加应力和变形的原因是:A.
自重应力
B.
有效应力
C.
基底压力
D.
基底附加压力
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【简答题】花青素随OH增多，吸收波长（）移，（）增加，随甲氧基增多吸收波长（）移，（）增加。
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