首页
登录
职称英语
The earliest process of making paper was done almost 5,000 years ago in Egyp
The earliest process of making paper was done almost 5,000 years ago in Egyp
游客
2024-02-02
23
管理
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. [br] 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://tihaiku.com/zcyy/3414435.html
相关试题推荐
[originaltext](5)Egyptianofficialsaremakingplanstoopenanewly-expan
[originaltext](5)Egyptianofficialsaremakingplanstoopenanewly-expan
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmosta
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmosta
随机试题
WhatdoesDramadonprevent?____________________.[br]WhyCan’tapersondrivea
PreparingChildrentoBeSafeatCollegeMoneycanbuymany
Theproposalisaimingat[br][originaltext]VotersinSwitzerlandhaverej
教育法律关系与一般法律关系的重要区别在于教育法律关系具有()。A.复杂性 B
为查明生产成本下降的真实性,审计人员可使用选取的进一步审计程序有()。A.重新
某建筑内设置了自动喷水灭火系统,下列喷头的安装,符合规范要求的是()。A.在管
下列属于基差走强的情形有( )。A.基差为正且数值越来越大 B.基差为负值且
发电厂的易燃油和天然气设施防静电接地的接地电阻不应大于()。 A.10Ω;B
如图6-12所示,容器壁圆开口直径D=0.6m,容器内水面相对压强为p0=9.8
男,6岁。身高80cm,智能落后,仅能数1~20个数。体检:皮肤粗糙,毛发干枯,
最新回复
(
0
)