热门试题:
[填空题]HXD3电力机车牵引通风机设在机车机械室地板支架上,由( )向主电动机送风。
[单项选择]病灶侧面神经瘫伴两眼向病灶侧注视不能,对侧中枢性舌瘫及偏瘫
A. Brown-Sequard综合征
B. Wallenberg综合征
C. 前核间性眼肌麻痹
D. Foville综合征
E. 闭锁综合征
[判断题]获取答案请关注微信公众号:蚂蚁专插本
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A.正确
B.错误
[单选题]已知某进制的运算满足100-21=46,则该进制为()。
A.十
B.八
C.七
D.六
[填空题]固定行车设备检查结果处理的规定,对危及行车安全的,应立采取<--错RC-->,并记入《行车设备检查登记簿》内。
[多选题]必须申请办理“安全作业证”的特殊作业有( )。
A.临时用电作业
B.断路作业
C.高空作业
D.容器内作业
E.盲板抽堵作业
[判断题]在公安网计算机的使用中,光盘刻录文件能够有效防止文件在传输过程中遭受病毒攻击,所以来历不明的光盘都可以在公安网计算机上使用。( )
A.正确
B.错误
[单项选择]男性,39岁,开始感觉疲倦、烦躁、头痛、食欲缺乏,以后逐渐出现腱反射异常,上行性多发性神经炎,并出现肌肉乏力和疼痛,腓肠肌压痛、痉挛,腿沉重麻木并有蚁行感。如需尽快纠正症状,可在医生的指导下服用()
A. 鱼肝油胶丸
B. 维生素B1
C. 维生素B2
D. 维生素B6
E. 维生素C
[单选题]《安全生产法》第二十八条规定:生产经营单位新建、改建、扩建工程项目的( ),必须与主体工程同时设计、同时施工、同时投入生产和使用。
A.A、生活设施
B.B、福利设施
C.C、安全设施
D.D、工作设施
[简答题]作业过程中,一旦联控通信中断,作业负责人应立即命令所有作业人员( )。
[判断题]制动运用限度:C100型敞车二、三位转向架闸瓦磨耗剩余厚度 ≥25mm。( )
A.正确
B.错误
[单项选择]糖尿病患者胰岛素治疗期间空腹血糖偏高的原因,下列哪些说法不正确()。
A. 黎明现象
B. Somogyi现象
C. 正常生物节律表现
D. 胰岛素抵抗
E. 夜间胰岛素量不够
[单项选择]有价证券是()的一种形式。
A. 商品证券
B. 权益资本
C. 虚拟资本
D. 债务资本
[判断题]经脉是由十二经脉和任、督二脉组成的。
A.正确
B.错误
[多选题]保护物资的方法有()。
A.堵截控制火势保护
B.用不燃或难燃材料覆盖
C.冷却保护
D.破拆法保护
E.就地燃烧
[判断题]由于不存在成本差异的计算与结转,原材料按实际成本计价适用于材料收发业务较多的企业。
[多选题]下列经济因素中,对长期总供给有决定性影响的有()。
A.政府购买
B.价格总水平
C.劳动
D.资本
E.技术
[单选题]在开车作业的封锁作业区两端必须保证()空闲
A.一站一区间
B.一站两区间
C.两站一区间
D.两站两区间
[单项选择]Le matin, elle prend un jus de fruits tout de suite après _________ .
A. s’être démise
B. s’être rendu compte
C. s’être laissée
D. s’être levée
[多选题]网点受理岗实时等待集中授权反馈指令包括( )。
A.授权通过
B.授权拒绝
C.授权撤销
D.转本地授权
E.影像补拍
[单项选择]男,26岁。急起血尿。少尿,水肿。高血压,肾功能急剧恶化。B超双肾增大,肾活检可见70%肾小球的肾小囊中有大新月体形成。最可能的诊断是
A. 急性链球菌感染后肾小球肾炎
B. 原发性肾病综合征
C. 紫癜性肾炎
D. 急进性肾炎
E. 狼疮性肾炎
[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 increase 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 combinations 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 increased 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 counteracting 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 obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance 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.
Why are ants compared to ecosystem engineers?
A.Because they build their own nests.
B.Because they collect food.
C.Because their activity affects the environment.
D.Because they are predators.
[单选题]按照规定,拥有1000张病床医院的医院感染发病率应低于( )。
A.7%
B.8%
C.9%
D.10%
E.15%
[单选题]客运服务指标列车运行正点率的指标值
A.≥98%
B.≥98、5%
C.≥99%
D.≥99、5%
[判断题]5.1项氧化性物质在一定的情况下,直接或间接放出氧气,减少了与其接触的可燃物发生火灾的危险性和剧烈性。
A.正确
B.错误
[多选题]“传世之宝”的报价单位为( ),( )以下保留两位小数。
A.人民币元/克
B.人民币元/盎司
C.元
D.美元/盎司
[判断题]人员工作中与110千伏设备带电部分的安全距离是1.2米。
A.正确
B.错误
[单选题]《局铁路旅客运输服务质量规范》旅客列车未全列停靠站台时,列车员严禁打开车门,立即报告( ),并加强车门看护。
A.列车长
B.车站人员
C.车辆人员
D.相邻车厢
[填空题]水质指标通常包括( )、( )、( )等三项指标。(77)
[多选题]移动式灭火器分为( )。
A.泡沫灭火器
B.干粉灭火器
C.卤代烷灭火器
D.二氧化碳灭火器
E.清水灭火器
[多选题]电算化会计信息系统中常见的硬件结构通常有()形式。
A.单机结构
B.多机松散结构
C.多用户结构
D.微机局域网络
[判断题]木桥枕承轨部分有切压现象,深度小于3mm,应评定劣化等级为C级( )。
A.正确
B.错误
[多选题]当前改善党的领导,应着力解决的问题包括( )。
A.要加强对党员的教育
B.要正确处理党的领导和依法治国的关系
C.要改革、完善党和国家的领导制度
D.要进一步解决提高党的领导水平和执政水平、提高拒腐防变和抵御风险能力这两大历史性课题
[判断题]带控制点工艺流程图一般包括:图形、标注和图例三个部分。()
A.正确
B.错误