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[单选题]上述化合物以甲苯-甲酸乙酯-甲酸(4:5:1)为展开剂,进行硅胶薄层层析时,其Rf值大小是0.05、0.29、0.43、0.46、0.56。Rf值(0.29)由大到小位列第四的是


A.七叶内酯

B.七叶苷

C.8-甲氧基香豆素

D.东莨菪素

E.5-羟基香豆素

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[多选题]世界之窗联锁区所含车站有()
A.侨城东站
B.华侨城站
C.世界之窗站
D.白石洲站
E.高新园站
[单项选择]经验证明,使用二次风可以使锅炉效率提高()%。
A. 4--10
B. 6--10
C. 2--10
D. 3--12
[单选题]【单选题】为什么婴幼儿易发生感染导致呼吸道阻塞?
A.呼吸浅快
B.支气管的管腔相对狭窄,黏膜血管丰富
C.呼吸系统发育不完善
D.呈腹式呼吸
[单项选择]
(五)

The common cold is the world’s most widespread illness, which is plagues that flesh receives.
The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses passing on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated Arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.
During the First World War soldiers who spent long periods in the trenches, cold and wet, showed no increased tendency to catch colds.
In the Second World War prisoners at the notorious Auschwitz concentration camp, naked and starving, were astonished to find that they seldom h
A. 4
B. 5
C. 6
D. 3
[单项选择]在我国城市规划法制建设相对滞后的情况下,有必要深入贯彻行政合理性原则。如何把握合法性原则和合理性原则的关系,正确使用合理性原则,在城市规划管理工作中显得尤为重要。这是因为( )。
A. 城市规划的目标是实现城市合理的布局、合理的结构、合理的形态,在规划管理的千变万化的实践中不得不采取合法又合理的自由裁量行为
B. 城市规划已形成的合理布局、合理结构、合理形态,由于规划管理实践中情况十分复杂,只能采取自由裁量行为
C. 城市规划一经批准就具有法律效力,尽管规划管理实践中情况十分复杂,只能合法不能有自由裁量行为
D. 城市规划一旦被批准,就具有合法性,在规划管理实践中自由裁量,就是贯彻了行政合理性原则
[单项选择]静脉肾盂造影,有诊断价值的疾病是()
A. 急性肾小球肾炎
B. 急性肾盂肾炎
C. 慢性肾小球肾炎
D. 慢性肾盂肾炎
E. 肾病综合征
[简答题]无权代理的法律后果。
[单项选择]球车和手拉车不可以开到一下哪个区域()
A. 果岭区
B. 发球台
C. 果岭和发球台
D. 球场任何区域
[简答题]问题同上
[单选题]直向允许通过速度不大于120km/h的道岔,护轨侧面磨耗轻伤标准为( )mm。
A.6
B.8
C.10
D.12
[填空题]

人类免疫缺陷病毒的传播途径有
①输入污染血液或血制品
②性接触
③()。


[单项选择]Human creativeness is boundless. With the advance of science and technology, a complete new means of communication -- Mobile Phone came to the world, which, being not fixed in one place like ordinary phones, greatly facilitates telephone communication. Although using mobile phone is convenient, it also has some negative factors. It tells us that we should pay more attention to the mobile phone etiquette. There is a research on American mobile phone etiquette.
People are using cell phones in a Manhattan subway. Most Americans believe that there are unspoken rules about using mobile phone etiquette, according to an online poll.
It’s impolite to shout down their cell phones which may frighten other passengers. Checking emails, sending text messages and making telephone calls while in the company of other passengers are definite breeches of mobile phone manners. Texting during a date is also strictly forbidden.
But the majority of American people questioned in the onli
A. happy and joy.
B. angry and depress.
C. ignorant and unstable.
D. sensitive.
[判断题]张三扒窃得李四钱包,刚走出5米被李四发现后逃跑,李四紧追50米时,张三将钱包扔还给李四。张三的行为是盗窃罪中止。
A.正确
B.错误
[单选题]车站现地级ATS信号机()表示信号机通信丢失或系统启动。
A.稳定蓝色
B.闪烁黑色
C.稳定粉色
D.浅灰色
[单选题]低压电气工作时,拆开的引线、断开的线头应采取( )等遮蔽措施。
A.胶带包裹
B.绝缘包裹
C.帆布遮盖
D.剪断包裹
[单选题]熔断器的保护特性又称为( )。 (1分)
A.时间性
B.安秒特性
C.灭弧特性
D.可能
[名词解释]续流
[填空题]铵油炸药(ANFO)是由()及其它附加剂组成的混合炸药。
[单项选择]由商业银行和其他金融机构为了吸引存款而发行的一种不记名的存款凭证是()。
A. 普通股股票
B. 证券投资基金
C. 银行承兑汇票
D. 大额可转让定期存单
[判断题]寒冷区域和容易冻结和可能出现沉降地区的消防水系统应有防沉降和防冻措施。
A.正确
B.错误
[单项选择]某临床医学专业研究生刚毕业即擅自开设诊所独立行医。依据《中华人民共和国执业医师法》,其行为属于
A. 个体行医
B. 执业医师行医
C. 执业助理医师行医
D. 未办理手续非法行医
E. 未取得医师资格非法行医
[单选题]电梯按钮、TVM/云购票机、闸机刷卡处、电梯扶手、扶梯扶手带、站台座椅(含高架站候车室座椅)、卫生间内手机置物架、门把手等消毒方式是( )。
A.使用拧干的抹布擦拭
B.用喷雾器喷洒(呈雾状)
C.使用棉质手巾擦拭
[多选题]以下属于法定行政处罚种类的有
A.警告、通报批评
B.罚款、没收违法所得、没收非法财物
C.暂扣许可证件、降低资质等级、吊销许可证件
D.限制开展生产经营活动、责令停产停业、责令关闭、限制从业
[单项选择]保持并完善()的基本地位,同时增加自然生态保护方面的内容,调整环境法的基本原则,把可持续发展作为立法的指导思想,倡导人口、经济、社会与生态相适应。
A. 《环境基本法》
B. 《环境保护法》
C. 《环境法》
D. 《环境影响评价法》
[判断题]电线接地时,人体距离接地点越近,跨步电压越低。
A.正确
B.错误
[单项选择]流体流过节流元件()的压力损失最小
A. 孔板
B. 文丘利管
C. 喷嘴
D. 挡板
[单选题]以下关于金融工具的分类,错误的是( )。
A.按期限的长短划分,金融工具分为短期金融工具和长期金融工具
B.按融资方式划分,金融工具可分为直接融资工具和间接融资工具
C.按投资人所拥有的权利划分,金融工具可分为债权工具、股权工具
D.按金融工具的职能划分,可分为三类:用于投资和筹资的工具,用于支付、便于商品流通的金融工具,用于保值、投机等目的的工具
[单选题]下列不属于掌沃通APP应用菜单的是:
A.移网
B.固网
C.宽融
D.终端
[单选题]抓好单车、单机、单泵、单艇等基本单元训练和( )训练,打牢技术战术基础。
A.队伍配合
B.号员单独
C.班(组)协同
D.班(组)联合
[单选题]目视道岔方向和高低:站在道岔外约( )左右处,面向道岔,先看道岔方向,后看道岔前后高低。
A.20~50m
B.30~70m
C.20~70m
D.30~50m
[多选题]营业机构柜员每日( )做到一日三碰库,确保账实相符。
A.现金
B.抵押物
C.重要空白凭证
D.有价单证
[单项选择]企业清算时,下列选项中清偿优先级最高的是()。
A. 债权人
B. 国家税收
C. 普通股股东
D. 优先股股东
[判断题]通过道口车辆上部或其货物装载高度(从地面算起)超过2m通过平交道口时,车辆上部及装载货物上严禁坐人。
A.正确
B.错误
[单项选择]不属于行政法规的是()
A. 母婴保健法
B. 医疗事故处理条例
C. 艾滋病防治条例
D. 国境口岸卫生监督办法
E. 中药品种保护条例
[单项选择]羊水过少与下列哪项因素有关()
A. 胚胎在12周以前
B. 胎儿肾发育不全
C. 胎儿肾缺如
D. 胎儿尿路梗阻
E. 以上都是
[单项选择]A very strange old man used to live in our town. He didn’t do anything as the rest of people did. He lived alone and didn’t talk to anybody. He liked to walk in the woods where there were no roads, following the narrow paths made by animals. People were afraid of him. They thought he was crazy and might do something terrible, like hurting one of the children.
One day a little boy disappeared. His parents looked for him for hours, anti finally the whole town started a search of the woods. Some people thought the strange old man had taken the child away.
Several hours later, the boy was found, very cold and hungry, and it was the old man, who knew the woods so well, who had found him. After that, he still lived alone and walked in the woods, but no one was afraid of him any more.
Which of the following statements is true
A. The old man had nobody to talk to.
B. The old man took the child away and then sent him back.
C. The old man wouldn’t change his Way of life.
D. What some people thought about was partly right.
[单项选择] Text
In common with many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government (26) new laws to stop smog from coal fires and factories and the (27) improved a lot.
Today, London is much cleaner (28) there is a new problem: smog from cars. In December 1991, there was very (29) wind in London and pollution (30) a lot, which led to 160 deaths in just four days.
(31) of the problem is the new" out of town" shopping centers. In the past, people often (32) to shops near their homes or went by bus. Today, many people drive to the new shopping centers. (33) , the small shops have (34) and more people have to go a long way to (35) their shopping.
Critics say that Britain needs better and cheaper public (36) Many
A. transport
B. traffic
C. service
D. supplement

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