首页
登录
职称英语
The great advance【C1】______rocket theory 40 years ago showed that liquid-fue
The great advance【C1】______rocket theory 40 years ago showed that liquid-fue
游客
2025-01-22
22
管理
问题
The great advance【C1】______rocket theory 40 years ago showed that liquid-fuel rockets were far【C2】______in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known.【C3】______, during the last decade, large solid-fuel rockets with【C4】______fuels about as powerful as liquid fuels have【C5】______their appearance, and it is a favorite layperson’s question to【C6】______which one is "better". The question is meaningless.【C7】______might as well ask whether a gasoline or a diesel engine is "better". It all【C8】______on the purpose. A liquid-fuel rocket is complicated,【C9】______has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when【C10】______.【C11】______, the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather【C12】______in construction,【C13】______hard to build when a really【C14】______size is desired. But once you have a solid-fuel rocket, it is ready for action【C15】______very short notice. A liquid-fuel rocket has to be fueled first and cannot be【C16】______readiness for very long after it has been fueled.【C17】______, once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited【C18】______desired(it could conceivably be stopped and reignited after a pre-calculated time of burning has e-lapsed. and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles【C19】______solid fuels, but human-piloted spaceflight needs the fine adjustments that can【C20】______be provided by liquid fuels. [br] 【C12】
选项
A、basic
B、elementary
C、easy
D、simple
答案
D
解析
与前文complicated相对应,此处应用其反义词simple。basic意为“基础的,初级的”,改进后的火箭结构不可能是“初级的",却可能是“简单的"。
转载请注明原文地址:https://tihaiku.com/zcyy/3923285.html
相关试题推荐
Withtheaccelerationoftechnologicaladvances,manypeopleconsiderapersonal
Someadvancedeconomies,notablyJapanandGermany,faredbetterthanothersdur
Whoeverformulatedthetheoryoftheoriginoftheuniverse,itisjust_________
Mary’sdaughter,althoughonlysixyearsold,showedingenuityinmakingadress
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
随机试题
Charmistheultimateweapon,thesupremeseduction,againstwhichthereare
[originaltext]WelcometoEastTimor,oneoftheworld’snewestcountries,a
WhatisthemostcreativepartofRobertFrank’sphotographybookTheAmericans’
如何理解保险合同的解释规则
皮亚杰采用( )研究儿童的心理发展。A.视崖实验 B.对偶故事 C.两难故
X线检查肺动脉高压表现是A.右下肺动脉干扩张 B.双肺纹理增多 C.右心室肥
在进行房地产估价时,适宜采用比较法估价的对象有()。A:房地产开发用土地B:公
根据《建设工程监理规范》工程监理单位应审查设计单位提出的新材料、新工艺、新技术、
根据绘图规则,双代号网络图如图3-4所示,绘图错误的有()。 A.有多余虚工
民航运输机场中,每条跑道都必须设置()。A.道肩 B.防吹坪 C.停止道
最新回复
(
0
)