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[不定项选择题]共用题干 Ants Have Big Impact on Environment as“Ecosystem Engineers”
Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators.The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.
Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil.This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.
Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.
Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”
“In this research,we studied for the first time how big this impact is and the subtleties of it.What we found is that despite being predators,their presence can also lead to an in-crease in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.
The study,carried out in Germany,studied the impact of the presence of different com-binations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area in-creased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.
Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counter-acting the positive influence via ecosystem engineering.”
Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obvi-ously reduces its richness. However,it is not clear how such disturbance damages the main-tenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms. What still remains unclear about ants,according to the last paragraph?
A.What roles do ants play in the ecosystem in which they live?
B.How do ants affect the animal diversity in a given ecosystem?
C.How do human activities affect ants'influence on a given ecosystem?
D.How do ants alter the physical and chemical environment?

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[简答题]生产中选择辅料有哪些要求?

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[填空题]In the front room of a shabby terraced house in Maryport, Cumbria, a woman lay on the sofa covered by a blanket, her body emaciated by years of illness.
66. ____________________
His father, also a Maryport man, had been often out of work; his son, now 15, aspires no higher than a factory job because he knows that he will be lucky to get even this when he leaves school. The family is beset by poverty, illness and despair. The man is dependent on tranquilizers; his wife has been in and out of psychiatrichospital. She said: "I got run down because we had so much debt and things just got on top of me."
Unemployment, said the man, sapped all his vitality. "It’s the same thing every day. You get off bed in the morning, eat and then back to bed, and that’s it," he said. The three children would have no heavy clothes this winter. They all lived on canned food and could not remember when they last ate fresh meat. When the fuel bills came in the rent could not be paid.
Un

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[单选题]消防员隔热防护服的贮存和使用期不宜超过( )年。
A.一
B.二
C.三
D.五

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[多选题]货车收费关于“轴限”和“轴型”的相关概念正确的有__________。( )
A.不同数量轮胎和车轴的组合类型称之为轴型
B.不同轴型的顺序编号称之为轴型编号
C.轴(轴组)的分解载重量称为轴限
D.各轴(联轴)的载值之和称之为总轴限

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[多选题]《特种设备使用管理规则》规定,特种设备使用单位的主要义务有( )。
A.建立并且有效实施特种设备安全管理制度和高耗能特种设备节能管理制度,以及操作规程
B.设置特种设备安全管理机构,配备相应的安全管理人员和作业人员,建立人员管理台账,开展安全与节能培训教育,保存人员培训记录
C.对特种设备作业人员作业情况进行检查,及时纠正违章作业行为
D.制定特种设备专项应急预案,定期进行应急演练;发生事故及时上报,配合事故调查处理等。

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[单选题]低压闭锁过流保护应加装闭锁（）。
A.电压
B.电流
C.电气
D.电容

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[单项选择]下列不是材质显示方式的是（）
A. 线框
B. 双面
C. 面贴图
D. 混合

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[简答题]有限空间一旦发生事故，如何进行应急救援？

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[单项选择]固定阳极X线管的阳极结构组成正确的是（）
A. 阳极头、转子、阳极帽
B. 靶面、转子、阳极柄
C. 靶面、阳极柄、阳极帽
D. 阳极头、阳极柄、阳极帽
E. 靶面、钼杆、阳极柄

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[多选题]城市轨道交通对供电可靠性有很高的要求,其运行方式主要有( )。
A.正常运行方式
B.非正常运行方式
C.检修运行
D.故障运行
E.停运
变电站的种类及作用

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[单选题]十九届四中全会提出,要健全党对外事工作领导体制机制,完善全方位外交布局,推进_______的开放体系建设,积极参与全球治理体系改革和建设。
A.合作共赢
B.互利共赢
C.合作互惠