热门试题:
[单项选择]各种网络传输介质( )。
A. 具有相同的传输速率和相同的传输距离
B. 具有不同的传输速率和不同的传输距离
C. 具有相同的传输速率和不同的传输距离
D. 具有不同的传输速率和相同的传输距离
[单项选择]Studies of the effect that makes many of us slumber or feel sleepy during the queen’s speech on Christmas Day have revealed that changes may be required in Britain’s drink drive legislation.
Dr James Home, director of the Sleep Research Laboratory at Loughborough University, is investigating post-lunch sleepiness. "We humans are designed to sleep twice a day, once at night and a short nap after lunch, but in this part of the world we tend to repress that."
It is a remnant of the same primeval programming that makes all animals in the bush rest in the hot afternoon sun to conserve energy.
"Hot environments make it worse and many cultures living near the equator," says Dr Home, "have conceded to the inevitable, where the afternoon siesta is the way of life."
In these studies Dr Home has been investigating the role of alcohol. "The theory is that if you are more sleepy after lunch then it figures that alcohol will be more potent after lunch. One would figure th
A. you will be refreshed．
B. you will be waken up．
C. you will feel far sleepier．
D. you will take a cat nap．
[单选题]蜜炙时，若蜜黏稠不能与药物拌匀时，可以（ ）。
A.增加用蜜量
B.加适量开水稀释
C.减少药量
D.加冷水稀释
E.以上都不是
[单项选择]根据我国现行规定，不同类别的建设工程项目应采用不同的组织实施方式，下列组合中正确的是( )。
A. 竞争性项目——代建制
B. 公益性项目——项目法人责任制
C. 非经营性政府投资项目——代建制
D. 基础性项目——代建制
[单选题]高层建筑内柴油发电机房储油间的总储油量不应超过( )h的需要量。
A.2
B.4
C.6
D.8
[单选题]用蒸馏水冲泡的茶汤品质( )。
A.汤色暗，苦涩味重
B.汤色好，滋味淡薄
C.汤色好，苦味重
D.汤色暗，香气低
[多选题]当所需预紧力很大时，为了减小螺栓尺寸，采用（ ） 来承受横向载荷。
A.套筒
B.键
C.插销
D.止档
E.垫圈
[单项选择]导游人员记错接站地点造成漏接，以下处理方法错误的是（）。
A. 尽量寻找客观原因，减轻自身责任
B. 向旅游者道歉，求得谅解
C. 主动赔付因漏接发生的费用
D. 用更加热情的服务消除旅游者的不快
[单项选择]当施工升降机安装高度大于（），并超过建筑物高度时，应安装红色障碍灯。
A. 100m
B. 120m
C. 50m
D. 30m
[单选题]索赔利润的款额计算通常按照（ ）计算。
A.由监理工程师计算报业主确认的利润额
B.采用承包商总部平均利润百分率
C.由承包商与业主双方协商确定的利润率
D.采用与原报价单中一致的利润百分率
[单项选择]
A. wealth
B. health
C. confidence
D. belief
[多选题]群众路线就是（）。 （ ）
A.一切为了群众
B.一切依靠群众
C.从群众中来
D.到群众中去
E.把党的正确主张变为群众的自觉行动
[判断题]设置水枪（炮）阵地要利用地形、地物，可依托防火墙、防火门、窗和承重构件等设置。
A.正确
B.错误
[单项选择]能够增大药物的溶解度，可用于注射剂的包台材料是（）
A. 葡糖基-β-CD
B. 乙基-β-CD
C. α-CD
D. γ-CD
E. β-CD
[单选题]业扩报装工作中，营销服务人员在公司产权设备范围内进行现场作业，应按照本规程第6.2节相关要求，填用相应（）。
A.A.派工单
B.B.工作票
C.C.操作票
D.D.工作任务单
E.略
F.略
G.略
[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.
What still remains unclear about ants,according to the last paragraph?
A.What roles ants play in the ecosystem in which they live.
B.How ants affect the animal diversity in a given ecosystem.
C.How human activities affect ants'influence on a given ecosystem.
D.How ants alter the physical and chemical environment.
[单选题][单选][特种设备]氨合成塔的外筒主要承受()。
A.高温和高压
B.只承受高温
C.只承受高压
[不定项选择](三)
甲房地产经纪机构在所在城市较有实力。该机构2009年参与交易的多数二手住宅价格上升，小部分二手住宅价格下降。经该机构调查，该市2009年初二手住宅销售均价为3 150元/㎡，月平均租金为21元/㎡。该市经济和房地产市场发展良好。李某通过该机构购买了一套二手住宅，并申请了抵押贷款。
如果该市住宅投资正常报酬率为8%，则该市住宅价格总体水平（ ）。
A. 明显偏高
B. 基本正常
C. 明显偏低
D. 难以判断
[多选题]交接试验中对10kV隔离刀闸应包括（____）试验内容。
A.测量绝缘电阻
B.测量隔离开关导电回路的电阻
C.交流耐压试验
D.检查操动机构线圈的最低动作电压
[单项选择]属于名城整体空间环境保护方法的是( )。
A. 城市宏观环境的保护
B. 逐步整治
C. 法定历史建筑的保护
D. 保护更新
[单项选择]上肢长骨常规体位选择为
A. 正位及侧位
B. 正位及斜位
C. 正位及切线位
D. 侧位及切线位
E. 斜位及切线位
[单选题]加入稀土可细化有害的非金属杂质的粒径,改善钢的耐磨性和( )。
A.重量
B.物理性
C.颜色
D.韧性
[多项选择]设备状态包括（）
A. 运行状态
B. 检修状态
C. 热备用状态
D. 冷备用状态
[判断题]220V直流系统停止时,将整流器启动.停止开关置于OFF位置。
A.正确
B.错误
[简答题]有一个10个字的数组存放在数据段，已知其起始地址为7A3CH：185FH，请问该数组在内存中的实际起始物理地址和末地址各为多少？此时，DS段寄存器中的内容为多少？
[单项选择]Vossius环见于哪种白内障（）
A. 钝挫伤性白内障
B. 后发性白内障
C. 代谢性白内障
D. 中毒性白内障
E. 老年性白内障
[填空题]
A--remote control
B--television signal
C--television station
D--outside broadcast van
E--television tower
F--television camera
G--TV studio
H--aside
I--executive editor
J--anchorman
K--program designer
L--TV drama/play
M--TV series
N--situation comedy
O--soap opera
P--entertainment show
Q--game show
R--variety show
（）节目策划人；（）电视遥控器
[单选题]如必需在管道上坐、立才能工作时，必须做好措施。
A.技术
B.安全
C.保护
[单项选择]
| 一遭受高压电击伤的病人，颅骨及头皮
5cm×5cm大小的缺损。 |
颅骨缺损修复的材料中必然产生免疫排斥的是
A. 自体颅骨外板
B. 有机玻璃
C. 聚甲基丙烯酸甲酯
D. 人工骨
E. 异种异体骨
[单选题]棘轮紧线器操作时，操作人员不得站在棘轮紧线器( )。
A.前方
B.后方
C.侧方
D.正下方
[单选题]决定商品交换价值量的是商品的
A.使用价值
B.价值
C.供求关系
D.自然属性
[判断题]起钻抽汲作用会增大井底压力,当井底压力低于地层压力时,就会造成溢流。( )
A.正确
B.错误
[单选题]3.267. 第1题
变压器铜损的大小与电流的平方成正比。
A.正确
B.错误
[多项选择]下列选项中，反映冷战后南北关系新变化的有（）
A. 南北关系中政治问题日益突出
B. 环保问题成为南北关系中的新问题
C. 建立国际新秩序的主张日趋一致
D. 区域集团内部的南北关系已经取代全球性南北关系
E. 资本流动出现了从南方国家向北方国家的回流
