(1)古代铜币表面绿色铜锈的主要成分是Cu2(OH)2CO3,,文物鉴定人员常用

题型:填空题

问题:

(1)古代铜币表面绿色铜锈的主要成分是Cu2(OH)2CO3,,文物鉴定人员常用酸验法鉴别铜锈真伪;用细玻璃棒蘸取少许稀盐酸,涂擦在需要鉴别可疑铜锈的部位,若有气泡产生则初定为铜锈,反应的化学方程式为______.

(2)某厂采用联合法生产硫酸铜、硫酸亚铁作饲料添加剂,主要步骤如下图所示:

写出上图中①、③反应的化学方程式:

①______;

③______;______.

考点:酸的性质化学反应方程式的书写文字表达式物质的相互转化和制备
题型:填空题

When you are learning English, you find it not clever to put an English sentence, word for word, into your own language. Take the sentence“How do you do? ” for example, if you look up each word in the dictionary, once at a time, what is your translation(翻译)? It must be a wrong sentence in your own language.

Languages don’t just have different sounds, they are different in many ways. It’s important to master(掌握) the rules for word order in the study of English, too. If the speakers put words in a wrong order, the listener can’t understand the speaker’s sentence easily. Sometimes when the order of words in an English sentence is changed, the meaning of the sentence changes. But sometimes the order is changed, the meaning of the sentence doesn’t change. Let’s see the difference between the two pairs of sentences.

“She only likes apples. ” “Only she likes apples. ”

“I have seen the film already. ” “I have already seen the film. ”

When you are learning English, you must do your best to get the spirit of the language and use it as the English speaker does.

小题1:From the passage we know that _______ when we are learning English.

A.we shouldn’t put every word into our own language

B.we should look up every word in the dictionary

C.we need to put every word into our own

D.we must read word by word小题2:The writer thinks it is _______ in learning English.

A.difficult to understand different sounds

B.possible to remember the word order

C.important to master the rules for word order

D.easy to master the rules for word order小题3:We can learn from the passage that _______.

A.the meaning of an English sentence always changes with the order of the words

B.the order of words can never change the meaning of an English sentence

C.sometimes different order of words has a different meaning

D.if the order of words is different, the meaning of the sentence must be different小题4:“ She only likes apples. ”___________

A.is the same as “Only she likes apples. ”

B.is different from “Only she likes apples. ”

C.means “She likes fruit except apples. ”

D.means “She doesn’t like apples. ”小题5:Which is the best title for the passage?

A.Different Orders, Different Meanings

B.How to speak English

C.How to put English into our Own Language

D.How to learn English

题型:填空题

— What’s the matter with Della?

— Well, her parents wouldn’t allow her to go to the party, but she still ________.

A.hopes to

B.hopes so

C.hopes not

D.hopes for

题型:填空题

驱虫药的主要作用是()

A.清热解毒

B.凉血止血

C.行气利水

D.驱虫或杀虫

E.燥湿杀虫

题型:填空题

One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP).RIP is the canonical example of a routing protocol built on the (71) algorithm.Routing protocols in internet works differ slightly from the idealized graph model.In an internet work,the goal of the routers to forward (72) to various networks.
Routers running RIP send their advertisement about cost every (73) seconds.A router also sends an update message whenever an update from another router causes it to change its routing table.
Routing protocols use different techniques for assigning (74) to individual networks.Further, each routing protocol forms a metric aggregation in a different way.RIP takes the simplest approach,with all link costs being equal (75) .Thus it always tries to find the minimum hop route.Valid distances are 1 through 15.This also limits RIP to runing on fairly small networks.

A.1
B.15
C.16
D.length of the link

题型:填空题

中国古代四大发明传入欧洲推动其社会转型,其中“替宗教改革开路,并使推广民众教育成为可能”的发明应该是()

A.印刷术和造纸术

B.火药和指南

C.指南针和印刷术

D.造纸术和火药

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