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
67
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:http://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
关于质量控制下列说法不正确的是()A.质量控制是审计质量要求和质量控制
商业银行贷款重组中的贷款结构主要包括()。A.贷款担保 B.贷款期限
现在有些儿童因饮食不合理而存在智力发展缓慢的问题。这些儿童缺乏的微量元素是()。
计算措施项目费时,脚手架搭拆费、脚手架租赁费的常用计算方法是()。A、分包计价法
金钱白花蛇来源于A.游蛇科红点锦蛇B.眼镜蛇科金环蛇C.眼镜蛇科眼环蛇D.眼镜蛇
患者,女性,33岁,出现右侧腰部剧烈疼痛,经尿常规及B超检查诊断为肾绞痛,应选哪
为完成原型定向阶段的主要学习任务,教师应做些什么工作?
药物产生副作用的药理学基础是A.药物安全范围小 B.用药剂量过大 C.药理作
关于资产类账户、权益类账户的内部钩稽关系的表述,正确的是( )。A.收入类账户
甲企业与乙企业签订一份技术开发合同,记载金额共计800万元,其中研究开发经费为5
最新回复
(
0
)