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【单选题】
施工简单，适应性广，具有断面小，抗水流冲刷能力强，可在深水中修建等优点的围堰是( )。A.
混凝土围堰
B.
土石围堰
C.
木笼围堰
D.
钢板桩格围堰
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举一反三
【单选题】Research completed in 1982 found that in the United States soil erosion ______.
A.
reduced the productivity of farmland by 20 percent
B.
was almost as severe as in India and China
C.
was causing significant damage to 20 percent of farmland
D.
could be reduced by converting cultivated land to meadow or forest
【简答题】Due to soil erosion, people living in the forest regions have to migrate annually in order to ______.
【多选题】Soil erosion includes the three processes of
A.
Dissolution
B.
Detachment
C.
Transport
D.
Deposition
E.
Adsorption
【简答题】土壤侵蚀类型 soil erosion type
【单选题】The sharp decrease of soil erosion in 1982 resulted from
A.
the education of the USDA on farming technology.
B.
the practices of environmental protection on farming.
C.
the prevention of water runoff in the two large areas.
D.
the protection of plant residues around the whole year.
【单选题】______ is causing soil erosion(侵蚀)in the game reserves.
A.
The bad weather
B.
The disappearance of vegetation which is eaten by the animals
C.
The violent storms
D.
The animals
【多选题】下列哪些行为属于疫情期间公安机关严厉打击的违法犯罪行为?(多选)
A.
以故意逃避、恶意阻挠、暴力抗拒等方式拒不配合防疫、检疫、强制隔离、隔离治疗
B.
编造与疫情有关的虚假信息或明知道是编造的虚假信息而传播,制造恐慌、扰乱社会秩序
C.
明知已感染或可能感染新型冠状病毒,还故意进入公共场所传播扩散或者隐瞒情况与让人接触
D.
囤积居奇、哄抬物价、牟取暴利,严重扰乱市场秩序
【简答题】危险品有几大类？内容分别是什么？
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