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
5
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
fact∧一that
解析
本题为从句误用。此处在fact后引导的说明性从句为同位语从句,同位语从句的引导词that不可以省略。
转载请注明原文地址:https://tihaiku.com/zcyy/3274608.html
相关试题推荐
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Plasticsarematerialswhicharesoftenedbyheatandsetintolastform1._
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[br][o
Whatmaterialswerenotusedforroadsurfacesduringthelastcentury?[br][o
随机试题
Tourismreallyisabigbusinessthesedays.It’s【B1】______.Itinvolveshot
[originaltext]GovernmentsfromSingaporetoSouthKoreaareincreasinglyli
Teachersneedtobeawareoftheemotional,intellectual,andphysicalchang
求极限
A.线粒体氧化体系 B.微粒体氧化体系 C.过氧化物氧化体系 D.氧化还原
下列哪项检查能够鉴别病毒性脑膜炎与化脓性脑膜炎A.头MRI B.血细菌培养
根据《招标投标法》的规定,下列关于开标参与人的说法不正确的有()。A、开标应当
在卓越绩效管理模式中,( )是组织之本,一切管理活动应当以激发和调动其主动性、
某500kV变电站的主变压器型式为:三相油浸自耦变压器,无载调压,冷却方式为强油
关于装配式预制混凝土梁存放的说法,正确的是()。A.预制梁可直接支承在混凝土存
最新回复
(
0
)