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
56
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
last——lasting
解析
本题为形容词误用。last表示“最后的”但此处并没有强调先后;lasting表示“永久的,持久的”指塑料的定型。
转载请注明原文地址:https://tihaiku.com/zcyy/3274600.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
TheNorwegianGovernmentisdoingitsbesttokeeptheoilindustryunderco
ItisadvisableforChinesestudentstolearnEnglishwordsbylinkingthemto_
无机结合料稳定类基层,也称半刚性基层,其主要分类不包括( )。A.石灰稳定类
临床一般不生用,多用醋炙品的是A:延胡索B:川芎C:补骨脂D:柴胡E:香
非居住房地产市场中不包括( )。A.商业用房市场 B.写字楼市场 C.工业
为保证地基的坚固、稳定和防止发生不均匀沉降,地基应满足的基本要求是()。A.
请选择你认为最为合理的一项,来填充所给数列的空缺项,使之符合原数列的排列规律:1
班杜拉认为,影响观察习得的行为操作的诱因有( )A.直接强化 B.替代强化
男,45岁。扩张型心肌病患者,行6分钟步行试验,步行距离为145米,应判断为(
下列关于电影的说法错误的是:A.《定军山》标志着中国电影的诞生 B.卓别林被称
最新回复
(
0
)