首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made
The earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made
admin
2016-04-30
32
问题
The earliest process of making paper was done almost 5,000 years ago in Egypt and the Nile Valley. In those days, paper was made from strips of the papyrus plant.
Modern paper-making began in China about 2,000 years ago. This process produced paper from cloth, straw, wood or the bark of trees. The raw materials are struck over and over until they become loose. Then they are mixed with water.
After the water has been removed, the flat, thin form remaining is permitted to dry. This becomes a sheet of paper.
Large machines started to be used for making paper near the end of the 16th century. Today, paper-making is a big business. But it is still possible to make paper by hand, since the steps are the same as using big machines.
You should choose paper with small amounts of printing. Old envelopes are good for this reason. Colored paper also can be used, as well as small amounts of newspaper. Small pieces of rags or cloth can be added. These should be cut into pieces about 5 centimeters by 5 centimeters.
Everything is placed in a container, covered with water, and brought to a boil. It is mixed for about 2 hours with some common chemicals and then allowed to cool. Then it is left until most of the water dries up. The substance left, called pulp, can be stored until you are ready to make paper.
When you are ready, the pulp is mixed with water again. Then the pulp is poured into a special box or mold. The mold is made of small squares of wire that hold the shape and thickness of the paper. To help dry the paper, the mold lets the water flow through the small wire squares.
After several more drying steps, the paper is carefully lifted back from the mold. It is now strong enough to be touched.
The paper is smoothed and pressed to remove trapped air. You can use a common electric iron used for pressing clothes.
Whether the paper is strong enough to be touched is determined by_____.
选项
A、how long the pulp is stored
B、how thick the paper is
C、how much water remains
D、what type of chemicals are used
答案
C
解析
倒数第2段提及要经过“多次干燥处理”,才能把纸取出,可见,纸是否足够坚韧以便取出,取决于纸浆中含有的水分的多少,因此,本题应选C。
转载请注明原文地址:https://kaotiyun.com/show/Kce7777K
0
大学英语四级
相关试题推荐
TheArtofFriendshipA)OneeveningafewyearsagoIfoundmyselfinananxiety.Nothingwasreallywrong—myfamilyandIwere
TheArtofFriendshipA)OneeveningafewyearsagoIfoundmyselfinananxiety.Nothingwasreallywrong—myfamilyandIwere
SixSecretsofHigh-EnergyPeopleA)There’sanenergycrisisinAmerica,andithasnothingtodowithfossilfuels.Millionsof
SixSecretsofHigh-EnergyPeopleA)There’sanenergycrisisinAmerica,andithasnothingtodowithfossilfuels.Millionsof
Anewstudyshowsthatstudentslearnmuchbetterthroughanactive,iterative(反复的)processthatinvolvesworkingthroughtheirm
Anewstudyshowsthatstudentslearnmuchbetterthroughanactive,iterative(反复的)processthatinvolvesworkingthroughtheirm
Teachingchildrentoreadwellfromthestartisthemostimportanttaskofelementaryschools.Butrelyingoneducatorstoappr
MuchofCanada’sforestryproductiongoestowardsmakingpulpandpaper.AccordingtotheCanadianPulpandPaperAssociation,C
TheincreasingAmericanizationofJapaneselifeisevidentinmanyways.Onesuchwayisthegrowingpopularityofcreditcards.
Todaywetalkaboutthedifferencebetweenacollegeandauniversity.Collegesanduniversitieshavealotincommon.Theyprep
随机试题
我国综合类证券公司在证券发行中面临着何种风险?
下述心电图变化不是典型二度Ⅰ型房室传导阻滞的是
建设单位申请领取施工许可证的法定审批条件中,对施工设计文件的要求是应当满足()。
补偿性余额是指银行要求借款人在银行中保持按贷款限额或实际借用额的一定百分比计算的最低存款余额,该百分比一般为()。
按()的不同,会计报表分为资产负债表、利润表和现金流量表。
套利定价理论认为,套利行为是现代有效市场形成的一个决定因素。根据套利定价理论,如果()的话,市场上就会存在无风险的套利机会。
甲公司与乙银行订立一份借款合同,甲公司到期未还本付息。乙银行于还本付息期限届满后1年零6个月时向有管辖权的人民法院对甲公司提起诉讼,要求甲公司偿还本金、支付利息并承担违约责任。乙银行的行为引起诉讼时效中断。( )
(2018年)20×7年7月10日,甲公司与乙公司签订股权转让合同,以2600万元的价格受让乙公司所持丙公司2%股权。同日,甲公司向乙公司支付股权转让款2600万元;丙公司的股东变更手续办理完成。受让丙司股权后,甲公司将其指定为以公允价值计量且其变动计入其
Wheredidthefarmerlive?Helivedin______
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthe【B1】______ofbrainheisbornwith.Humanbr
最新回复
(
0
)