首页
登录
职称英语
Glass fibers have a long history. The Egyptians made coarse fibers by 1600 BC
Glass fibers have a long history. The Egyptians made coarse fibers by 1600 BC
游客
2023-12-22
46
管理
问题
Glass fibers have a long history. The Egyptians made coarse fibers by 1600 BC, and fibers survive as decorations on Egyptian pottery dating back to 1375 BC. During the Renaissance(fifteenth and sixteenth centuries AD, glassmakers from Venice used glass Line fibers to decorate the surfaces of plain glass vessels. However, glassmakers guarded their secrets so carefully that no one wrote about glass fiber production until the early seventeenth century.
The eighteenth century brought the invention of "spun glass" fibers. Rene-Antoine de Reaumur, a French scientist, tried to make artificial feathers from glass. He made fibers by rotating a wheel through a pool of molten glass, pulling threads of glass where the hot thick liquid stuck to the wheel. His fibers were short and fragile, but he predicted that spun glass fibers as thin as spider silk would be flexible and could be woven into fabric.
By the start of the nineteenth century, glassmakers learned how to make longer, stronger fibers by pulling them from molten glass with a hot glass tube. Inventors wound the cooling end of the thread around a yarn reel, then turned the reel rapidly to pull more fiber from the molten glass. Wandering tradespeople began to spin glass fibers at fairs, making decorations and ornaments as novelties for collectors, but this material was of little practical use: the fibers were brittle, ragged, and no longer than ten feet, the circumference of the largest reels. By the mid-1870’s, however, the best glass fibers were finer than silk and could be woven into fabrics or assembled into imitation ostrich feathers to decorate hats. Cloth of white spun glass resembled silver: fibers drawn from yellow-orange glass looked golden.
Glass fibers were little more than a novelty until the 1930s, when their thermal and electrical insulating properties were appreciated and methods for producing continuous filaments were developed. In the modern manufacturing process, liquid glass is fed directly from a glass-melting furnace into a bushing, a receptacle pierced with hundreds of fine nozzles, from which the liquid issues in fine streams. As they solidify, the streams of glass are gathered into a single strand and wound onto a reel. [br] The word "coarse" in the first paragraph is closest in meaning to______.
选项
A、decorative
B、natural
C、crude
D、weak
答案
C
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3296282.html
相关试题推荐
Glassfibershavealonghistory.TheEgyptiansmadecoarsefibersby1600BC
Glassfibershavealonghistory.TheEgyptiansmadecoarsefibersby1600BC
Glassfibershavealonghistory.TheEgyptiansmadecoarsefibersby1600BC
Glassfibershavealonghistory.TheEgyptiansmadecoarsefibersby1600BC
Glassfibershavealonghistory.TheEgyptiansmadecoarsefibersby1600BC
Americaissaidtohavethemostsuccessfuleconomicsysteminhistory.But
Americaissaidtohavethemostsuccessfuleconomicsysteminhistory.But
Americaissaidtohavethemostsuccessfuleconomicsysteminhistory.But
Americaissaidtohavethemostsuccessfuleconomicsysteminhistory.But
______isthefirstimportantgovernessnovelintheEnglishliteraryhistory.A、
随机试题
【B1】[br]【B10】A、greatB、manyC、muchC考查词义辨析。many表示“许多”,指的是数量。great和much都表示“多”,指
Middleagehasitscompensations.Youthisboundhandandfootwiththesha
Allpeoplehavesomeabilitytomanagetheirhealthandthehealthofthose
C
女性,12岁。因畏寒,发热,咽痛两天由母陪同就医。诊断:急性扁桃体炎。给青霉素等
公文,以其规范的体式、法定的效力,以其体现意志的团体性和所产生作用的强制性,对写
2020年,F省全年粮食产量502.32万吨,比上年增加8.42万吨,增长1.7
培训的印刷材料中,岗位指南的作用不包括( )。A.节约培训成本 B.提高学习
反补贴.反倾销针对( )不公平贸易而采取的措施。A.进口产品激增的情况 B.
对业主方项目管理的目标而言,进度目标是指项目的()。A.立项时间目标 B.竣
最新回复
(
0
)