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
11
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] 【C15】
选项
A、for
B、with
C、on
D、at
答案
D
解析
at short notice是一个词组,即“一发出通知或指令便立刻(行动)”。
转载请注明原文地址:https://tihaiku.com/zcyy/3923288.html
相关试题推荐
Hewaslookingimpatientatthevisitingsalesman,whoshowednosignsofgettin
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
随机试题
[originaltext](5)Egyptianofficialsaremakingplanstoopenanewly-expan
制定交易计划具有以下()等好处。A、可以使交易者被迫考虑可能被遗漏或考虑不周的问题B、可以使交易者明确自己正处于何种市场环境C、可以使交易者明确何时
小学美术《陶泥的世界》主要教学过程及板书设计 教学过程 环节一:导入新课 教师播放音乐,学生聆听:猜猜“是什么发出这样的声音”?(陶瓷乐器)引出课题《陶
点A(20、15、10)在点B(15、10、15)的()。A.左前上方 B.
交流电源接地系统主要包括工作接地、防静电接地、防雷接地3种形式。()
东风刮来的云朵里,细腻如酥的雨丝儿飘落下来,当云朵被____得支离破碎时,丝丝状
1.满足人民基本文化需求是社会主义文化建设的基本任务。必须坚持政府主导,按照
唾液中除含有淀粉酶外,还有A.凝乳酶 B.蛋白水解酶 C.溶菌酶 D.肽酶
(2018年真题)甲参加抽奖活动得彩电一台,遂将旧电视机丢弃,该旧电视机被乙捡到
某机械设备的预算价格为40万元,残值率为5%,预计使用2500个台班。则该机械台
最新回复
(
0
)