首页
登录
职称英语
Plastics are materials which are softened by heat and set into last form 1._
Plastics are materials which are softened by heat and set into last form 1._
游客
2023-12-15
6
管理
问题
Plastics are materials which are softened by heat and set into last form 1.______
when are shaped in a mold. Some are natural; some are semi-synthetic, the 2.______
result of chemical action on natural substance; some are synthetic, built up
from the constituents of oil or coal. All is based on the chemistry of carbon, 3.______
with its capacity of forming chains. The molecules that compose them 4.______
(monomers) link together in the setting or curing process to form chains
(polymers), which give plastics their flexible strength. Some plastics retain
their ability to be softened and reshaped; as wax, they are thermoplastic. 5.______
Others set permanently in the shapes they are given by heat and pressure;
like bags, they are thermosetting.
From industrial beginnings in nineteenth century, plastics have 6.______
struggled through a hundred and twenty years of glory, failure, disrepute
and suspicion on the slow road to public acceptance. Now, at last, one can
positively say that plastics are appreciated and enjoyed for what they are;
that they make modern life rich, more comfortable and convenient, and 7.______
also more fun. Plastics are warm materials, sympathetic with the human 8.______
touch, and their transformation into things that come into contact with human
beings is entirely appropriate.
The fact there are plastic antiques comes as a shock to most people. 9.______
How can a material that seems so essentially twentieth century, and one
that is so much associated with cheap, disposed products, has a history 10.______
at all? It is a young technology, and a great part of the fun of collecting
plastics is that beautiful pieces of historical interest can still be found very
cheaply. [br]
选项
答案
as—like
解析
本题为介词误用。此处举例,可以用like或such as,不能单独用as,单独使用表示“作为……”。
转载请注明原文地址:https://tihaiku.com/zcyy/3274604.html
相关试题推荐
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[br][o
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[br][o
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[br][o
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[origina
随机试题
Womendriversaremorelikelytobeinvolvedinanaccident,accordingtosc
买进看跌期权的交易者在履行期权合约后将成为标的物_的多头。()A、正确B、错误B看跌期权的买方在行权后向期权的卖方出售一定数量的标的物,所以应该是空
Throughouthistory,manhashadtoacceptthefactthatalllivingthingsmu
房室瓣关闭主要是由于A.心房收缩 B.心室收缩 C.乳头肌收缩 D.房室瓣
与发行股票相比,发行债券融资的优点是()。A:企业财务负担小 B:企业经营灵
组成蛋白质的氨基酸不包括A.谷氨酰胺B.苏氨酸C.鸟氨酸D.酪氨酸E.组氨酸
丙戊酸钠的说法,不正确的是A:对各种类型癫痫可首选 B:对失神发作疗效优于乙琥
1.一个人要立足社会并成就一番事业,除了刻苦学习,努力掌握专业知识、技能以外,更
活体捐赠肾脏和尸体器官分配的准则是A.1988年由国际移植学会发布的 B.19
在本企业法定代表人授权范围内,建设工程施工方项目经理的管理权力包括()。A
最新回复
(
0
)