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【单选题】某工程，安全等级为二级;拟建在对抗震不利地段、地形地貌简单、地基为湿陷性黄土。应按那种等级布置勘察工作
A.
二级;
B.
一级;
C.
三级;
D.
视场地复杂程度确定;
【单选题】Passage One The climate of earth has fluctuated quite a bit over the last 4.6 billion years of our planet’s history and it can be expected that the climate will continue to change. One o...
A.
The climate of earth has fluctuated quite a hit over the last 4.6 billion years.
B.
An increase in the earth’s temperature will have major consequences for all life on this planet.
C.
The information we have got makes us unable to explain the global warming completely.
D.
The Pleistocene began about 1.8 million years ago.
【多选题】下列关于黄土的叙述，正确的是 [ ]
A.
黄土很黏重，土质呈酸性，是低产土壤之一
B.
黄土由较细的粉沙颗粒组成，便于耕作
C.
黄土富含氮、磷、钾等养分，比较肥沃
D.
黄土是人工土壤，是由于人类长期耕作形成的