What is the most important factor for a rocket to escape from the Earth? [br] Wh

游客2024-07-24 46

问题 What is the most important factor for a rocket to escape from the Earth? [br] Why is it not necessary to provide powered flight in space all the time?

选项 A、Few spacecrafts complete their flight operations.
B、The Earth’s gravity cannot be overcome.
C、No further power is needed after the escape speed is reached.
D、Free fall takes the place of the Earth’s gravity pull.

答案 C

解析从文章第三段第一句"一旦火箭达到了脱离地心引力的速度，就不再需要更多的能量"，可以判断出此题的答案应为C。

转载请注明原文地址:http://tihaiku.com/zcyy/3690439.html

相关试题推荐

Theworkerswerepaid______inthisfactory.A、byanhourB、byhourC、bythehou
FromthefirstletterwelearnthatMary______.[br]Themostimportantrulefo
WhatisthemostimportantfactorforarockettoescapefromtheEarth?[br]Ho
Thepolicemustwastenotimein______theescapedmurdererintheforest.A、sea
The(manage)______ofacompanyisaveryimportantpartoftheworkingprocess
Theproduction______ofthefactoryisnow800,000units.A、abilityB、powerC、capa
The______(manage)ofacompanyisaveryimportantpartoftheworkingprocesst
Theknowledgewegainedinschoolisveryimportant,______wewilldependinthe
CarsareanimportantpartoflifeintheUnitedStates.Withoutacarmost
CarsareanimportantpartoflifeintheUnitedStates.Withoutacarmost

随机试题

【B1】[br]【B4】A、themselvesB、theirC、theirownCofone’sown意为“某人自己的”。
Mr.Blackwasyoungandable.Thebosslikedhim.Lastmonthhewassentto
Backintheday,agoodreportcardearnedyouaparentalpatontheback,b
Inherearlydaysasanemergencyroomphysician,Dr.JoannaMeyertreateda
Neon(霓虹)istoHongKongasredphoneboothsaretoLondonandfogistoSan
()不是影响硫铵结晶于母液中成长速率和晶形的因素。A.母液中杂质 B.母液
一个有远大理想和坚强意志的人，难以被任何困难和心理压力所压服，这说明此人具有良好
患者，男性，27岁。农民。因发热、头痛、腰痛、口鼻出血5天入院。20天前参加秋收
110（66）kV及以上电压等级变电站应至少配置两路站用电源。
当前中国经济正在发生的三个根本性转变是（）。 A.经济发展方式的根本性转变

最新回复(0)

What is the most important factor for a rocket to escape from the Earth? [br] Wh

Theworkerswerepaid______inthisfactory.A、byanhourB、byhourC、bythehou

FromthefirstletterwelearnthatMary______.[br]Themostimportantrulefo

WhatisthemostimportantfactorforarockettoescapefromtheEarth?[br]Ho

Thepolicemustwastenotimein______theescapedmurdererintheforest.A、sea

The(manage)______ofacompanyisaveryimportantpartoftheworkingprocess

Theproduction______ofthefactoryisnow800,000units.A、abilityB、powerC、capa

The______(manage)ofacompanyisaveryimportantpartoftheworkingprocesst

Theknowledgewegainedinschoolisveryimportant,______wewilldependinthe

CarsareanimportantpartoflifeintheUnitedStates.Withoutacarmost

CarsareanimportantpartoflifeintheUnitedStates.Withoutacarmost

【B1】[br]【B4】A、themselvesB、theirC、theirownCofone’sown意为“某人自己的”。

Mr.Blackwasyoungandable.Thebosslikedhim.Lastmonthhewassentto

Backintheday,agoodreportcardearnedyouaparentalpatontheback,b

Inherearlydaysasanemergencyroomphysician,Dr.JoannaMeyertreateda

Neon(霓虹)istoHongKongasredphoneboothsaretoLondonandfogistoSan

()不是影响硫铵结晶于母液中成长速率和晶形的因素。A.母液中杂质 B.母液

一个有远大理想和坚强意志的人，难以被任何困难和心理压力所压服，这说明此人具有良好

患者，男性，27岁。农民。因发热、头痛、腰痛、口鼻出血5天入院。20天前参加秋收

110（66）kV及以上电压等级变电站应至少配置两路站用电源。

当前中国经济正在发生的三个根本性转变是（）。 A.经济发展方式的根本性转变