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
2017-11-17
27
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/dUa7777K
0
大学英语四级
相关试题推荐
A、Childrenweremorelikelytodrinktoomuchsoda.B、Attentionproblemshadnothingtodowithageandsex.C、Drinkingsodamig
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorably(坚定地)thatitiseasyt
Afewdegreescanmakeabigdifferencewhenitcomestofoodstorage.Foodscangobadiftheygettoowarm.Butformanyofth
Imagineyouwenttoarestaurantwithadate;hadaburger,paidwithacreditcard,andleft.Thenexttimeyougothere,thew
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Theonlysurvivorofashipwreckwaswasheduponasmall,uninhabitedisland.Heprayed【C1】______forGodtorescuehim,andeve
TheLostArtofListeningA)"Whywon’theevenlistentomyidea?""WhyamIcutoffbeforeIprovidethewholestory?"How
Intoday’seconomy,it’stoughenoughbeingarestaurantowner,butnowyouhavetosafeguardyourgarbage,too.FromCalifo
Afewdegreescanmakeabigdifferencewhenitcomestofoodstorage.Foodscangobadiftheygettoowarm.Butformanyofth
Afewdegreescanmakeabigdifferencewhenitcomestofoodstorage.Foodscangobadiftheygettoowarm.Butformanyofth
随机试题
下面关于对电影添加声音说法错误的是:
A.贫血、乏力、腹部肿块B.肠梗阻、排便习惯与粪便性状改变C.两者均有D.两者均无右侧结肠癌常有的临床表现是
对于扩张性心肌病的特征,下述哪个不合理
A.维生素D400U/d,口服B.维生素D10kU/d,口服C.维生素D每次800kU,肌内注射,每周1次,共3次D.维生素D每次300kU,肌内注射,每隔2周1次,共3次E.维生素D100kU/d,口服治疗重度维生素D缺乏性佝
在完全竞争的市场类型中,没有企业能够控制市场的价格和使产品差异化。( )
某综合性企业2016年度发生如下业务:(1)与A公司签订一份易货合同,约定用本企业市场价格为120万元的库存商品换取A公司市场价格为140万元的原材料,支付A公司差价款20万元。(2)与B公司签订一份加工合同,受托为其加工一批特殊商品,原材料由该综合
人物:范蠡、张仲景、杜甫、李贺、吴道子誉称:画圣、诗鬼、商圣、医圣、诗圣代表著作:《伤寒杂病论》、《送子天王图》、《兵车行》、《雁门太守行》、《计然篇》
十九大的主题是:不忘初心,(),高举中国特色社会主义伟大旗帜,决胜全面建成小康社会,夺取新时代中国特色社会主义伟大胜利.为实现中华民族伟大复兴的中国梦不懈奋斗。
坚持依法治国,需要发挥法律的作用,反对以德治国,以法治代替德治。()
Abalanceddietprovidesanadequateintakeofnutrientsformaintenanceofthebodyandthereforegoodhealth.Adietcaneasil
最新回复
(
0
)