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
2023-12-27
29
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/3308728.html
相关试题推荐
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
SincehebecamefifthNo.1overallpickinRocketshistory,dozensofarticles
Touristsdon’thavetobookahotelreservationinadvance.[br][originaltext]
Touristsdon’thavetobookahotelreservationinadvance.[br][originaltext]
Touristsdon’thavetobookahotelreservationinadvance.[br][originaltext]
Touristsdon’thavetobookahotelreservationinadvance.[br][originaltext]
Touristsdon’thavetobookahotelreservationinadvance.[originaltext]If
随机试题
室内消火栓开启后本体渗漏可能因为箱体有损坏。()
超声波
企业发生的下列各项利息支出,不应该计入财务费用的是()。A.应付债券的利息
下列哪项不是面白所主病证A.血虚证 B.阳虚证 C.阴虚证 D.气虚证
治疗外伤出血兼瘀血肿痛,应首选A白及 B仙鹤草 C三七 D牡丹皮 E赤芍
简述企业员工配置的方法。
在周工作时间标准为40小时的情况下,采取四班三运转的轮休制,每个月应安排( )
简述现代企业人力资源管理各个历史发展阶段的特点。
耳聋左慈丸的功能是A.滋肾平肝 B.清肝泻火 C.芳香化浊 D.解毒化腐敛
O型血A.红细胞膜上含A凝集原,血清中含抗B凝集素 B.红细胞膜上不含A和B凝
最新回复
(
0
)