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
55
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
中国有4000多年的历史,是世界最古老的文明之一。从公元前21世纪的夏朝开始至清朝结束,中国历史上经历过几十个朝代的变更。每个朝代在政治、经济、文化、科
Onetypeofpersonthatiscommoninmanycountriesistheonewhoalwaystr
下列各选项中,属特种菜单的是( )。A.家庭菜单 B.团体菜单 C.宵夜点
(2021年真题)私募基金募集应当履行的程序有()。 Ⅰ.特定对象确定和
材料一 1949年3月23日下午,西柏坡阳光明媚,毛泽东同志从住了10个月的小
以上为自身免疫性疾病的是A.急性化脓性腮腺炎 B.慢性复发性腮腺炎 C.流行
(2018年真题)根据相关规定,中国人民银行当地分支行应于规定时间内对开户银行报
采用非匀速进展横道图比较法比较工作实际进度与计划进度时,涂黑粗线的长度 表示
某高聚物分子的一部分为 在下列叙述中,正确的是( )。 A.它是缩聚反
对于原地基处理,下面哪个说法不正确()A.在非岩石地基上,填筑填石路堤前,应按
最新回复
(
0
)