热门试题:
[多选题]参加带电作业的人员，应经（）后，方可参加相应的作业。
A. A.集中培训
B.B.考试合格取得资格
C.C.单位批准
D.D.专门培训
[单项选择]反应器汽包底部排污水是（）。
A. 排向排污闪蒸罐后排入地沟
B. 连续排污
C. 间断排污向间歇排污罐
D. 排向低压冷凝液罐
[单选题]动车组每标准编组车底配备（）辆垃圾小推车。
A.1
B.2
C.3
D.4
[单选题]全自动车钩内部剪切过载保护值为（）KN。
A.550
B.650
C.775
D.900
[判断题]担保贷款办理展期或续贷的，还应当由担保人出具同意的书面证明并签订有关合同或协议，续贷业务还应按规定重新办理押品抵（质）押登记手续。
A.正确
B.错误
[多项选择]犯罪构成的共同要件有（）
A. 客体
B. 客观方面
C. 主体
D. 主观方面
[单项选择]传统上，高精技术产业属于哪类产业（）
A. 全球产业
B. 国际产业
C. 多国产业
D. 跨国产业
[单选题]《铁路电力安全工作规程》（铁运【1999】103号），内燃发电机组和发电车应保证在（）内即可运转发电。
A.15分钟
B.30分钟
C.一小时
D.二小时
[单选题]A型标桩为基本型,沿铁路线路安全保护区边界每( )左右设置一个。
A.100m
B.200m
C.300m
D.400m
[多项选择]下列证候中，哪项是陈皮的主治证（）
A. 肝郁胁痛
B. 湿痰咳嗽
C. 风痰咳嗽
D. 寒痰咳嗽
E. 胃热呕吐
[判断题]在没有脚手架或者在没有栏杆的脚手架上工作，高度超过1.5m时，应使用安全带，或采取其他可靠的安全措施。（）
A.正确
B.错误
[多选题]下列航空器中属于轻于空气的航空器的有( )。
A.气球
B.滑翔机
C.直升机
D.飞艇
E.飞机
[单选题]下列各项，属急性胰腺炎患者局部并发症的是
A.弥散性血管内凝血
B.胰腺脓肿和假性囊肿
C.急性呼吸窘迫综合征
D.败血症
E.消化道出血
[单项选择]温病内闭外脱证治疗用（）
A. 清营汤加安宫牛黄丸
B. 羚角钩藤汤加安宫牛黄丸
C. 清营汤合大定风珠
D. 生脉散加温病"三宝"
E. 犀角地黄汤合参附汤
[判断题]在实际的生产劳动中，周围环境的温度直接影响到劳动者的心情、工作效率，甚至会导致事故的发生。
[单选题]将钢淬火后进行高温回火，这种双重热处理的操作方法称为（ ）。
A.高温热处理
B.调质处理
C.正火处理
D.退火处理
[单项选择]颅内压增高的"三主征"包括（）。
A. 偏瘫，偏盲，偏身感觉障碍
B. 头痛，呕吐，偏瘫
C. 头痛，抽搐，意识障碍
D. 头痛，呕吐，视盘水肿
E. 头痛，呕吐，血压增高
[多项选择]城市公共交通规划必须符合的原则包括( )。
A. 符合优先发展公共交通的政策，为城市居民出行提供多样、便捷、舒适的公交服务
B. 满足一定时期城市客运交通发展的需要，并留有余地
C. 根据城市发展规模、用地布局和道路网规划
D. 在客流预测的基础上，确定公共交通的系统结构
E. 运行快捷、使用方便、高效、节能、经济
[单选题]1924年我国第一本《教育心理学》教科书出版，它的作者是( )。
A.陶行知
B.蔡元培
C.潘菽
D.廖世承
[单选题]焊接作业轨温应不低于0℃，且应避免大风和雨雪等不良天气，否则应采取相应措施。放行列车时，焊缝温度应低于（ ）℃。
（应知应会-《普速铁路线路修理规则》-第4.4.3条）
A.300
B.400
C.500
D.600
[单项选择]螺旋统计计算时按螺栓的（）从小到大依次排列统计出来，最后累加得出螺旋数量。
A. 大小
B. 数量
C. 长短
D. 规格
[不定项选择题]A.小建中汤
A.理中丸
B.吴茱萸汤
C.归脾汤
D.左金丸
E.肝寒上犯之胃脘疼痛呕吐，嘈杂吞酸者，宜首选
[不定项选择题]共用题干
第三篇
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.throuah moving the soil by nest building activity and by collecting food they affect 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 Conservation,said,
"Ants are very effective predators which thrive in huge numbers.They're also very territorial and very ag-
gressive,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 den-
sities of black garden ants and common red ants,both of which can be found across Europe,including 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 op-
posite effect,the predation 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 the ecosystem not only because they constitute a great part of the ani--
mal 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.
[单项选择]H3C流量清洗设备在发现攻击后，通过哪种引流手段实现流量牵引处理（）
A. OSPF
B. RIP
C. BGP
D. 静态路由
[单选题]肢体能抬离床面，但不能抗阻力提示肌力为
A.A:1级
B.B:2级
C.C:3级
D.D:4级
E.E:5级
[填空题]根据事故造成的人员伤亡、直接经济损失、列车脱轨辆数、中断铁路行车时间等情形，事故等级分为____、重大事故、较大事故和一般事故。
[单选题]治疗蛋白质-能量营养不良之疳积证的方剂宜选用
A.肥儿丸
B.八珍汤
C.资生健脾丸
D.参苓白术散
E.石斛夜光丸
[判断题]在曲线上作业，两端要设好防护。若有列车开来，应携带工具及时下道避车，人身及工具不得侵入限界。
A.正确
B.错误
[单选题]风力大于()级时禁止攀登油罐作业。
A.4
B.5
C.6
[单项选择]“城市的土地属于国家所有”的规定，是______年修订颁布的《宪法》第十条正式宣布的。
A. 1972
B. 1982
C. 1992
D. 2002
[多选题]煤矿安全风险辨识管控等级：分为( )四个等级。
A.重大风险
B.较大风险
C.一般风险
D.低风险
[判断题]铺设混凝上岔枕时,应用Ⅱ型混凝土枕过渡。（ ）
A.正确
B.错误
[单选题]全面实现10千伏及以上大中型企业客户省力、省时、省钱“三省”服务，办电环节压减至4（3）个以内、平均接电时间压减至60天以内、10千伏客户电网环节压减至（ ）个工作日。
A. 9
B. 10
C. 11
D. 12
