首页
登录
职称英语
The paper industry needed wood pulp in the early 1800s because ______. [br] [or
The paper industry needed wood pulp in the early 1800s because ______. [br] [or
游客
2023-11-19
32
管理
问题
The paper industry needed wood pulp in the early 1800s because ______. [br]
In the early 180Os, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn’t keep up with the growing demand for paper. The United States alone was using 250 thousand tens of rags each year. And a quarter of that had to be imported. It was clear that a new source of fiber was needed to keep up with the demand for paper. The answer to this problem turned out to be paper made from wood pulp, something that was abundantly available in North America. In Canada, the first wood pulp mill was set up in 1866 and it was immediately successful. But while wood pulp solved the problem of quantity it created a problem of quality. Wood contains a substance called lignin; The simplest way to make large quantifies of cheap paper involved leaving the lignin in the wood pulp. But lignin is acidic and its presence in paper has shortened the life expectancy of paper from several centuries for rag paper to less than a century for paper made from wood pulp. This means that books printed less than a hundred years ago are already turning yellow and beginning to disintegrate, even though books printed much earlier may be in the conditions.
选项
A、It can be found in rags.
B、It can shorten the life expectancy of paper.
C、It is easy to separate lignin form wood pulp.
D、It is impossible to separate lignin from wood pulp.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3200174.html
相关试题推荐
Allflights______becauseofthesnowstorm,manypassengerscoulddonothingbut
Hewillremainhereif______.A、neededB、needtobeC、needbeD、needisC
Helenlistenedcarefully______shemightdiscoverexactlywhatsheneeded.A、inth
Withallthedataheneeded______,Peterbegantowritehisthesis.A、collecting
Jackcannevergethighmarksinhismathsexam,becausehetendstoregardhis
Howmanychaptersdidthespeakerfinishreading?[br][originaltext]BecauseI
Howmanychaptersdidthespeakerfinishreading?[br][originaltext]BecauseI
Howmanychaptersdidthespeakerfinishreading?[br][originaltext]BecauseI
Howmanychaptersdidthespeakerfinishreading?[br][originaltext]BecauseI
Howmanychaptersdidthespeakerfinishreading?[originaltext]BecauseIwasbu
随机试题
Aprinternumberedconsecutivelythepagesofabook,beginningwith1onthefi
下列描述中,( )不是软件体系结构研究的内容。A.软件体系结构描述语言及工具
下列关于普通股筹资定价的说法中,正确的是( )。A.股票溢价发行的,发行价格应
技术经济指标用以衡量()的水平。A、科技创效 B、技术管理 C、组织施工
循环性缺氧的原因不包括A.休克 B.心力衰竭 C.血管病变 D.栓塞 E
招标工作排序的基本步骤中,招标实施过程中的限制和假设的上一步骤为()。A、项目招
根据证券经纪业务瓷金账户开立的般要求,客户开立资金账户时必须签署()等文件。A:
患其他传染病死亡的尸体A.进行消毒处理 B.立即进行卫生处理、就近火化 C.
某工程施工至某月底,经偏差分析得到费用偏差(CV)>0,进度偏差(SV)<0,则
高血压病的诊断及诊断依据
最新回复
(
0
)