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
22
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
[originaltext]Theprivatemotorvehiclehasgivenusafreedomourancestor
Howmenfirstlearnttoinventwordsisunknown;inotherwords,theorigin
在中国,孩子的满月酒(One-Month-OldFeast)是其人生中第一个重要仪式。孩子满月那天,家人邀请亲朋好友来一起庆祝。通常孩子穿上狗头帽(d
Weliveinasocietywherethereisalotoftalkaboutscience,butIwouldsay
Thegraduatecommitteemustbeinfullaccordintheirapprovalofadissertatio
Sheissmart(indeed)______,sheisagenius.indeed本题考查副词用法。她确实很聪明,她是个天才。副词indee
企业自由现金流量与股权自由现金流量是评估企业价值的两个重要参数,下列关于这两个指
由于承包商原因引起的延误一般是由于其管理不善所引起。比如计划不周密、组织不力、指
A.缺失 B.缺失 C.缺失 D.缺失 E.缺失需要用托确定正中位关系和
关于建设工程项目管理的说法,正确的有()。A.建设工程项目管理工作的核心任务是
最新回复
(
0
)