水泥混凝土路面施工时，拌和引气混凝土的搅拌楼一次拌和量不应大于其额定搅拌量的( )。
A. 95%
B. 90%
C. 85%
D. 80%
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鞣质为一类
A. 没食子酸鞣质
B. 复杂的多元酚类化合物
C. 酚酸与糖或多元醇以苷键或酯键结合而成化合物
D. 黄烷-3-醇的聚合物
E. 可水解鞣质、缩合鞣质
石质路堑开挖方式中，( )是当前广泛采用的开挖施工方法。
A. 横向开挖法
B. 纵向开挖法
C. 钻爆开挖
D. 静态破碎法
The author thinks that the conclusions of any research about people's state of mind are ______.
A. surprising
B. confusing
C. illogical
D. questionable
What conclusion can be drawn from the passage
Anxiety, though unavoidable, can be coped with.
B. Children's anxiety has been enormously exaggerated.
Children's anxiety can be eliminated with more parental care.
D. Anxiety, if properly controlled, may help children become mature.
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