问题 单项选择题

在对某一区域进行水土流失预测与评价时,计算得到该区域的水力侵蚀强度为 3000t/(km2·a),则该区域的侵蚀强度分级属于( )。

A.轻度侵蚀
B.中度侵蚀
C.强度侵蚀
D.极强度侵蚀

答案

参考答案:B

解析:在对某一区域进行水土流失预测与评价时.水力侵蚀强度小于200 t/(km2·a)km2(上标)·a, 500t/(km2·a)km2·a,1000 t/(km2·a)km2·a(分别指东北黑土区和北方土石山区,南方红壤丘陵区和西南土石山区,西北黄土高原区),属微度侵蚀;水力侵蚀强度为 200 t/(km2·a),500t/(km2·a),1000 t/(km2·a)(分别指东北黑土区和北方土石山区,南方红壤丘陵区和西南土石山区,西北黄土高原区),属轻度侵蚀;水力侵蚀强度为 2500~5000t/(km2·a),属中度侵蚀;水力侵蚀强度为5000~8000 t/(km2·a),属强度侵蚀;水力侵蚀强度为8000~15000t/(km2·a),属极强度侵蚀;水力侵蚀强度为大于15000 t/(km2·a),属剧烈侵蚀。

单项选择题

I want to divide human understanding into two kinds—classical understanding and romantic understanding. In terms of ultimate truth, a distinction of this sort has little meaning, but it is quite legitimate when one is operating within the classic mode used to discover or create a world of underlying form. The terms classical and romantic, as Phaedrus used them, mean the following:
A classical understanding sees the world primarily as underlying form itself. A romantic understanding sees it primarily in terms of immediate appearance. If you were to show an engine or a mechanical drawing or electronic scheme to a romantic, it is unlikely he would see much of interest in it. It has no appeal because the reality he sees is its surface. Dull, complex lists of names, lines and numbers. Nothing interesting. But if you were to show the same blueprint or give the same description to a classical person, he might look at it and then become fascinated by it because he sees that within the lines and shapes and symbols is a tremendous richness of underlying form.
The romantic mode is primarily inspirational, imaginative, creative, intuitive. Feelings rather than facts predominate. "Art" when it is opposed to "Science" is often romantic. It does not proceed by reason or by laws. It proceeds by feeling, intuition and esthetic conscience. In the northern European cultures the romantic mode is usually associated with femininity, but this is certainly not a necessary association.
The classic mode, by contrast, proceeds by reason and by laws—which are themselves underlying forms of thought and behavior. In the European cultures it is primarily a masculine mode and the fields of science, law and medicine are unattractive to women largely for this reason. Although motorcycle riding is romantic, motorcycle repair and maintenance are purely classic. The dirt gives it such a negative romantic appeal that women never go near it.

As you see it, ______ would best describe the tone of this passage.

A.neutral and factual

B.indignant and secretive

C.upbeat and enthusiastic

D.personal yet reasonable

单项选择题