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[单项选择]DNA变性后,下列哪一项变化是正确的?()
A. 对260nm紫外吸收减少
B. 溶液粘度下降
C. 磷酸二酯键断裂
D. 核苷键断裂
E. 嘌吟环破裂

热门试题:

[单选题]*风机风量调节的基本方法有( )。
A.节流调节;
B.变速调节;
C.轴向导流器调节;
D.节流*变频*轴向导流器调节。
[单项选择]单位活期帐户启用时错误的是().
A. 必须取得开户许可证
B. 可支取日期必须大于开户日期三天
C. 交易无需授权
D. 打印特殊业务申请书
[不定项选择题]竞争性拮抗药的特点是
A.亲和力及内在活性都强
B.与亲和力和内在活性无关
C.具有一定亲和力但内在活性弱
D.有亲和力、无内在活性,与受体不可逆性结合
E.有亲和力、无内在活性,与激动药竞争相同受体
[单选题]特发性大发作合并失神发作选用
A.卡马西平
B.丙戊酸钠
C.促肾上腺皮质激素
D.氯硝西泮
E.快速静脉注射地西泮
[单选题]CRH5型动车组的空气压缩机是“ ”压缩机。
A.一体式
B.单元式
C.螺杆式
D.涡旋式
[判断题]根据我国《保险法》的规定,财产保险合同的保险金额不得超过保险价值;超过保险价值的,超过的部分必须加倍交纳保险费。( )
[单选题]对献血者,发给国务院卫生行政部门制作的无偿献血证书,以下说法正确的是
A.有关单位应当给予适当补贴
B.有关单位应该给予适当补贴
C.有关单位可以给予适当补贴
D.有关单位尽量给予适当补贴
E.有关单位必须给予适当补贴
[单项选择]It is all very well to blame traffic jams, and the quick pace of modem life, but manners on the roads are becoming horrible. Everybody knows that the nicest men become monsters behind the wheel. It is all very well, again, to have a tiger in the tank, but to have one in the driver’s seat is another matter altogether. You might tolerate the odd road-hog, the rode and inconsiderate driver, but nowadays the well-mannered motorist is the exception to the nde. Perhaps the situation calls for a "Be Kind to Other Drivers" campaign, otherwise it may get completely out of hand.
Road politeness is not only good manners, but good sense too. It takes the most cool-headed and good-tempered of drivers to resist the temptation to revenge when subjected to uncivilized behavior. On the other hand, a little politeness goes a long way towards relieving the tensions of motoring. A friendly nod or a wave of acknowledgement in response to an act of politeness helps to create an atmosphere of goodwill
A. the driver’s acknowledgement of politeness and regulations
B. the driver’s tolerance of rude or even savage behaviors
C. the driver’s prompt response to difficult and severe conditions
D. the driver’s ability to understand and react reasonably
[多选题]带电插拔肘型电缆终端接头时应()。
A.使用绝缘操作棒
B.戴绝缘手套
C.戴护目镜
D.穿绝缘靴
E.略
F.略
[单项选择]以下关于亲情通说法错误的是()。
A. 本业务申请人限18岁以上有民事行为能力的人办理。
B. 客户需提供两个移动手机号码作为监护方号码与被监护方号码,两个号码必须为同一个身份证开户。
C. 本业务要求配合省公司入围的亲情通终端使用,方能实现全部业务功能。
D. 亲情通业务资费向监护方号码收取。
[单选题]以下不属于信息系统工作组织方式的是( )?
A.变电第二种工作票
B.口头、电话命令执行
C.信息工作任务单
D.信息工作票
E.略
F.略
[判断题]改按天气恶劣难以辨认信号的办法行车,天气转好时,应及时恢复正常行车并报告列车调度员。
A.正确
B.错误
[判断题]由于在远场区超声波束会扩散,所以探伤应尽可能在近场区进行
A.正确
B.错误
[单项选择]五岳中以秀丽著称的是()。
A. 泰山 
B. 华山 
C. 衡山 
D. 恒山
[单选题]UNI是用户和网络之间的接口,位于接入网的( ),支持各种类型的业务接入。
A.网络侧
B.用户侧
C.支路侧
D.业务侧
[判断题] 党对公安工作的领导主要是政治领导、思想领导和业务领导。
A.正确
B.错误
[单项选择]肺泡表面活性物质减少将会使
A. 肺弹性阻力减小
B. 肺顺应性增大
C. 肺泡内液体层表面张力减小
D. 小肺泡内压大于大肺泡内压
[单选题]空调面板上热空气 FAULT(故障)灯亮时:
A.热空气压力调节活门自动关闭,配平空气活门自动关闭
B.热空气压力调节活门自动打开,配平空气活门自动关闭
C.热空气压力调节活门自动关闭,配平空气活门自动打开
D.热空气压力调节活门打开,配平空气 活门打开,无影响
[判断题]所有许可手续(工作许可人姓名、许可方式、许可时间等)均应记录在操作票上。
A.正确
B.错误
[单项选择]促进其他药物透过血脑屏障的药物是()
A. 藿香
B. 冰片
C. 石菖蒲
D. 苏合香
E. 蟾蜍
[多选题]《中华人民共和国劳动法》规定:国家对( )实行特殊劳动保护。
A.童工
B.未成年工
C.女职工
D.青少年
[多项选择]与阴维脉相会的十二经脉有
A. 足太阴经
B. 足太阳经
C. 任脉
D. 足厥阴经
[判断题]天气恶劣难以辨认信号时的调车作业调车信号开放后,遇到有危及人身或行车安全情况时,可以变更。
A.正确
B.错误
[单项选择]甲公司2011年年初产权比率为80%,所有者权益为50000万元;2011年年末所有者权益增长8%,产权比率下降10个百分点。假如该公司2011年实现净利润3000万元,则其2011年度的资产净利润率为( )。
A. 3.28%
B. 3.30%
C. 3.33%
D. 3.35%
[简答题]干湿交替
[判断题]颚式破碎机用于煤样的粗碎或中碎,不得超范围使用。调整排料粒度时,严禁颚板和定颚板相碰撞。
A.正确
B.错误
[简答题]航食车
[多选题]劳动竞赛可设立( )的一、二、三等奖,或先进单位、优胜班组、先进个人等奖项。
A.单位
B.团体
C.班组
D.个人
[不定项选择题]共用题干 第二篇

In many of the developinlg countries in Africa and Asia,the population is growing fast.The reason for this is simple:Women in these countries have a high birth rate一from 3.0 to 7.0 children per woman.The majority of these women are poor,without the food or resources to care for their families.Why do they have so many children?Why don't they limit the size of the family?The answer may be that they often have no choice.There are several reasons for this.
One reason is economic.In a traditional agricultural economy,large families are helpful.Having more children means having more workers in the fields and someone to take care of the parents in old age.In an industrial economy,the situation is different. Many children do not help a family;instead,they are an expense.Thus,industrialization has generally brought down the birth rate.This was the case in Italy,which was industrialized quite recently and rapidly.In the early part of the twentieth century,Italy was a poor,largely agricultural country with a high birth rate.After World War Ⅱ,Italy's economy was rapidly modernized and industrialized.By the end of the century,the birth rate had dropped to 1.3 children per woman,the world's lowest.
However,the economy is not the only important factor that influences birth rate.Saudi Arabia, for example,does not have an agriculture-based economy,and it has one of the highest per capita incomes in the world.Nevertheless,it also has a very high birth rate(7.0).Mexico and Indonesia, on the other hand,are poor countries,with largely agricultural economies,but they have recently reduced their population growth.
Clearly,other factors are involved.The most important of these is the condition of women.A high birth rate almost always goes together with lack of education and low status for women.This would explain the high birth rate of Saudi Arabia.There,the traditional culture gives women little education or independence and few possibilities outside the home.On the other hand,the improved condition of womnen in Mexico,Thailand,and Indonesia explains the decline in birth rates in these countries.Their governments have taken measures to provide more education and opportunities for women.
Another key factor in the birth rate is birth control.Women may want to limit their families but have no way to do so. In countries where governments have made birth control easily available and inexpensive ,birth rates have gone down.This is the case in Singapore,Sri Lanka,and India,as well as in Indonesia,Thailand,Mexico,and Brazil.In these countries,women have also been provided with health care and help in planning their families.
These trends show that an effective programn to reduce population growth does not have to depend on better economic conditions. It can be effective if it aims to help women and meet theii needs.Only then,in fact,does it have any real chance of success. According to this passage,Italy today is an example of an__________.
A.agricultural country with a high birth rate
B.agricultural country with a low birth rate
C.industrialized country with a low birth rate
D.industrialized country with a high birth rate
[单选题]下列可以用PS软件制作的是?( )
A. 施工图纸
B. 数据统计
C. 骨骼绑定
D. 图像合成
[单选题]设三相异步电动机的空载功率因数为λ1,20%额定负载时功率因数为λ2,满载时功率因数为λ3,那么,如下关系式成立的是(  )。
A.λ1>λ2>λ3
B.λ1<λ2<λ3
C.λ1<λ3<λ2
D.λ1>λ3>λ2
[单选题]TMS列车总线,可以通过()实现扩展,即实现2列车重联。
A.MVB总线
B.信号系统
C.半自动车钩
D.自动车钩
[单选题]元大公司开发的楼盘中所有户型都是400平方米以上的大户型,在400平方米以上的大户型中有50%是独栋别墅。只有购买了独栋别墅的业主才可以同时享受物业提供的24小时送餐服务和免费小区超市代购服务。如果上述判定为真,并且事实上是李先生从元大公司购房后享有免费小区超市代购服务,则以下哪项一定为真?( )Ⅰ.李先生肯定可以享受物业提供的24小时送餐服务。Ⅱ.这套房子肯定是独栋别墅。Ⅲ.这套房子的面积肯定超过400平方米。
A.只有Ⅰ
B.只有Ⅱ
C.只有Ⅲ
D.只有工、Ⅱ和Ⅲ
[单选题]下面关于油品氧化说法正确的是( )。
A.空气不流通会加快油品的氧化
B.温度升高会导致油品氧化速度变慢
C.光的照射、接触金属等都会促进油品氧化
D.光的照射会降低油品氧化速度
[单选题]需要使用装载加固装置和加固材料的货物,应按规定对装载加固装置和加固材料的数量、( )、规格进行检查。
A.材质
B. 质量
C. 外形
D.外观
[单选题]商业银行可采用映射外部数据的技术估计平均违约概率。关于该项技术,下列说法有误的是( )。
A.银行可将内部评级映射到外部信用评级机构或类似机构的评级,将外部评级的违约概率作为内部评级的违约概率
B.评级映射应建立在内部评级标准与外部机构评级标准可比的基础上
C.评级映射时,对同样的债务人内部评级和外部评级可相互比较
D.银行应避免映射方法或基础数据存在偏差和不一致的情况,所使用的外部评级量化风险数据应针对债务人的违约风险,并反映债项的特征
[单选题]代理农村义务教育中央专项资金支付业务, 是指在农村义务教育经费保障机制改革中, 中央财政负担的专项资金由_________拨付下达后, 由农业银 行代理的省级财政部门和县级财政部门中央专项资金的财政直接支付业务。
A.省政府
B.人民银行
C.财政部
D.市政府
[单项选择]产妇王某,产后2周出现弛张热,下腹疼痛且压痛明显,下肢肿胀伴疼痛,皮肤紧张发白,最可能的诊断是()
A. 子宫肌炎
B. 取血栓性静脉炎
C. 急性盆腔结缔组织炎
D. 急性盆腔腹膜炎
E. 产后关节炎

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