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
2024-01-26
24
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/3396343.html
相关试题推荐
[originaltext](3)TennisplayersmustwearalmostallwhiteatWimbledon.T
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
There’sNoPlaceLikeHome[A]Onalmostanynightofthe
Theearliestprocessofmakingpaperwasdonealmost5,000yearsagoinEgyp
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmosta
FormanypeopleintheU.S.,sportsarenotjustforfun.Theyarealmosta
随机试题
MostofushaveanimageofastandardEnglishinpronunciation,andverycom
Theheartisanimportantorganofcirculation______functionistopumpbloodt
【S1】[br]【S2】H本空需要填入一个及物动词;联系上文,第一段一直在将印度人口与中国人口数量做比较,上一句已经指出,印度对人口出生率虽有控制,但不如中
WhatdomostAmericansthinkabouticecream?Theyconsiderthaticecreamis__
环节一:课堂导入 播放视频:2019年开学第一课《五星红旗,我为你自豪》片段。 问题:视频中的人物和故事给你什么感受?这些故事共同体现了什么主题?为什么要弘
《中华人民共和国政府采购法》第二十四条规定,两个以上的自然人、法人或者其他组织可
医疗保险的特点包括()A.医疗保险金的给付条件与疾病诊断直接相关 B.
现场承载板法测定土基回弹模量测定需要检测以下哪些参数()A.路基含水率
运用路线价法估价的步骤一般分为()。A.划分路线价区段—设定标准深度—调查
下列各项属于中央银行特征的有( )。 A.以营利为目的 B.经营普通银行
最新回复
(
0
)