在无线列调系统中,一般用()表示中频信号A、RF B、AF C、IF D、ZF

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问题:

在无线列调系统中,一般用()表示中频信号

A、RF

B、AF

C、IF

D、ZF

考点:铁路通信工技能考试铁路通信工(无线维护)铁路通信工(无线维护)题库
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维护病患者的健康利益和其他合法权益是()

A.执业药师的责任

B.执业药师的权力

C.执业药师的义务

D.执业药师的权利

E.执业药师的执业行为规范

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根据骨折是否与外界相通,可把骨折分为

A.外伤性骨折和不稳定性骨折

B.压缩性骨折和横行骨折

C.稳定性骨折和不稳定性骨折

D.完全性骨折和不完全性骨折

E.开放性骨折和闭合性骨折

题型:单项选择题

(本题共14分)

A~J分别表示中学化学中常见的一种物质,它们之间相互关系如下图所示(部分反应物、生成物没有列出),且已知G为主族元素的固态氧化物,A、B、C、D、E、F六种物质中均含同一种元素。请填写下列空白:

(1)A、B、C、D、E、F六种物质中的含有同一种元素在周期表中位置         

(2)写出检验D溶液中阳离子的方法                              

(3)写出反应④的离子方程式                                         

(4)若28gA单质在足量的氧气中灼烧,反应放出的热量为QkJ(Q>0),写出这个反应的热化学方程式:                                             

(5)若向气体K的水溶液中加入盐酸,使其恰好完全反应,所得溶液的pH      7

(填“>”、“<”或“=”),用离子方程式表示其原因:          ;若向气体K的0.1mol/L水溶液中加入pH=1的硫酸,且氨水与硫酸的体积比为1:1,则所得溶液中含各离子物质的质量浓度由大到小的关系是                                         

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One day newly wedded Nancy lost her ring while helping to plant potatoes. Friends were called and the field was searched long but in vain(徒劳). Later, when the potatoes were harvested, Everyone looked out for the ring but it remained lost. Another year came round and all the farmers working in the field kept their eyes open. The following year was the same. And year after year, whoever had business in the field always had Nancy’s ring in his mind.

Then the farm changed hands but it went no farther than to cousins. So the memory of the lost ring remained alive until thirty-eight years had passed. Then came a spring day when a man was ploughing the field behind a pair of horses. Even after thirty-eight years he still looked out for the ring, and knew just which part of the field Nancy had lost it in. At this time, when he came there, he found it .He picked it up, put it carefully into his pocket, left his horse, and ran all the way down to the village and placed it into Nancy’s hand.

小题1: How did Nancy come to lose her ring?

A.She lost it while helping to harvest tomatoes in the field

B.She lost it while watering the plants in the field.

C.She lost it while working in the field.

D.She lost it while helping to plant potatoes in the field.小题2: Why did people keep looking for the ring even after the farm changed hands?

A.It was a very expensive ring

B.They all wanted to solve the mystery.

C.They all loved Nancy.

D.Everybody wanted to have this ring.小题3: What did the ploughman do after finding the ring?

A.He picked it up and put it in his pocket.

B.He ran back to tell everybody in the village.

C.He placed it in a secret spot.

D.He returned it to the owner.小题4:. What can you infer from the story?

A.The ring was invaluable.

B.People on the farm were honest and helpful.

C.The ring’s disappearance was the work of supernatural power.

D.Nancy no longer expected that her ring would be found again.

题型:单项选择题

据《吕氏春秋》记载:“公作则迟,有所匿其力也;分地则速,无所匿其力也。”这段引文说明()

A.铁农具与牛耕的运用使生产力显著提高

B.奴隶主贵族大量占有私田

C.各国先后都承认了土地私有

D.封建剥削方式比井田制进步

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