厨房中的食醋也可除水垢,这主要是利用食醋中含有的乙酸(CH3COOH)的酸性来完

题型:填空题

问题:

厨房中的食醋也可除水垢,这主要是利用食醋中含有的乙酸(CH3COOH)的酸性来完成的,CH3COOH可用HAc表示,如与氢氧化镁反应可表示为:2HAc+Mg(OH)2═Mg(Ac)2+2H2O,则醋酸与水垢中碳酸钙反应的化学方程式为:                   

考点:化学反应方程式的书写化学图标化学反应方程式的配平化学反应方程式的意义
题型:填空题

阅读下列材料:

材料一 罗马《十二铜表法》规定:“树枝越界的,应修剪至离地十五尺,使树阴不至影响邻地;如树木因风吹倾斜于邻地,邻地所有人亦可诉诸处理;”“在夜间窃取耕地的庄稼或放牧的,如为适婚人,则处死以祭谷神;如为未适婚人,则由长官酌情鞭打,并处以赔偿双倍于损害的罚金。”

材料二 对债权的规定和解释是罗马法的一项重要内容。它制定了解决各类债务纠纷时适应的条款,而且特别明晰地规定了契约的各种形式,以及契约双方的权利和义务。

材料三 “在罗马人那里,私有制和私法的发展没有在工业和贸易方面引起进一步的后果,因为他们的生产方式没有改变。”但当资本主义经济在封建社会内部逐渐发展起来时,“详细拟定的罗马法便立即得到恢复并重新取得威信。”……即使在英国,为了私法(特别是其中关于动产的那一部分)的进一步发展,也不得不参照罗马法的诸原则。——《马克思恩格斯全集》第3卷

请回答:

(1)根据材料一,概括《十二铜表法》的特点。

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(2)简要说明“对债权的规定和解释是罗马法的一项重要内容”的原因。

________________________________________________________________________________

(3)根据材料二、三及所学知识,简要分析罗马法的历史作用及其影响。

________________________________________________________________________________

题型:填空题

按照新黄皮书的规定,对全部工程或部分工程的缺陷责任期已终止的确认是通过工程师颁发( )的形式来完成。

A.接收证书

B.履约证书

C.竣工证书

D.优质证书

题型:填空题

阅读理解。

     Burn rate is the speed at which a startup business consumes money. My rate was $ 75,000 a month.

Four months after my company was set up, I had only a quarter of the starting capital left in the bank.

     Looking for guidance, I went to talk to my friend, Arthur Walworth about my new venture. "Times

of great change always bring out the risk-takers," he said."And they leave winners and losers. My

grandfather invested a lot of money in a project of Thomas Edison' s that ended up in failure."

      I was lost in thought at the notion(an idea or belief about something) of a Thomas Edison project

ending in failure. Damn. It could happen to anybody! I must continue.

     At that time CD-ROM sales had bombed, so investors were fleeing from the field. I didn't turn away

from mine entirely, but instead linked it to the internet.

     My plan was to offer consumers descriptions of home-design products by using a special software

and let them modify the designs. Then we can enable them to get online professional and constructional

help to have their houses built, decorated and furnished according to their own choice.

      To realize my plan I needed investors, so I continued to meet regularly with venture capitalists. One

said I had a great idea. But I needed to test it. Get the money somewhere. To get this money from a

venture capitalist is going to cost my wife and my children! He turned down my request.

     Wife? Children? I hardly remembered them.

      I was working nonstop-struggling to turn the key in the lock, to find the right way ahead. The pressure

was terrible. It was just at this time that my parents and sisters stepped up. Two hundred thousand dollars.

A lot of money to them, invested in this crazy son and brother without a moment's hesitation. Dad and

Mom had driven out from Chicago and seen the passion in my little office and the trouble at home.

     With their help my company survived and has been prospering ever since.

1. When the author's company started operation, he had _____.

A. $ 450,000

B. $ 400,000

C. $ 350,000

D. $ 300,000

2. Arthur implies that to start a business in times of change, people have to _____.

A. rely on famous people all be time

B. invest as much money as possible

C. face the risks of possible failure

D. think about nothing but success

3. The author's company was engaged in _____.

A. furniture design and production

B. online home-design service

C. traditional home designing

D. home decoration business

4. Faced with a very unfavorable market situation, the author decided _______ .

A. to improve his service

B. to start a new business

C. to withdraw his money

D. to reduce his investment

题型:填空题

某一级公路设计行车速度V=100kN/m,双面六车道,汽车荷载采用公路-Ⅰ级。其公路上有一座计算跨径为40m的预应力混凝土箱形简支桥梁,采用上、下双幅分离式横断面。混凝土强度等级为C50,横断面布置如图所示。

提示:按《公路桥涵设计通用规范》(JTG D 60-2004)和《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D 62-2004)计算。

计算该后张法预应力混凝土简支箱形梁桥的跨中断面时,所采用的有关数值为:A=96m2,h=2.25m,I0=7.75m4,中性轴至上翼缘边缘距离为0.95m,至下翼缘边缘距离为1.3m;混凝土强度等级为C50,Ec=3.45×104MPa;预应力钢束合力点距下边缘距离为0.3m。假定在正常使用极限状态短期效应组合作用下,跨中断面弯矩永久作用标准值与可变作用频遇值的组合设计值Ssd=85000kN·m。试问,该箱形梁桥按全预应力混凝土构件设计时,跨中断面所需的永久有效最小预应力值(kN),与下列何项数值最为接近().

A.61000

B.61500

C.61700

D.62000

题型:填空题

油的沸点可达200℃以上,如豆油为______。

A.200℃

B.210℃

C.221℃

D.230℃

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