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

游客2024-07-24 19

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:https://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

[originaltext]IfyouareinterestedinstudyingatanAmericanuniversity,
Fillinthemissingnumbersinthissequence:15873×7=11111115873×14=222222
在中国金融期货交易所，套期保值和套利交易的持仓均不受限制。()A、正确B、错误A各交易所对套期保值交易头寸实行审批制，其持仓不受限制，而在
WelcometoNorthRoadMedicalCenter!We
下列选项中，不属于施工项目目标控制问题的要素的是（）。A.施工项目 B.控制
手术人员手消毒时，化学消毒剂需浸泡至_________。
被称为“君主之官”的是A:心B:肝C:脾D:肺E:肾
变压器的负序电抗与正序电抗相等。
（2018年真题）烟叶税的税率是（）。A.3％ B.5％ C.20％
下列不属于流通企业物流的是（）。A.生产企业物流 B.批发企业物流 C

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

[originaltext]IfyouareinterestedinstudyingatanAmericanuniversity,

Fillinthemissingnumbersinthissequence:15873×7=11111115873×14=222222

在中国金融期货交易所，套期保值和套利交易的持仓均不受限制。()A、正确B、错误A各交易所对套期保值交易头寸实行审批制，其持仓不受限制，而在

WelcometoNorthRoadMedicalCenter!We

下列选项中，不属于施工项目目标控制问题的要素的是（）。A.施工项目 B.控制

手术人员手消毒时，化学消毒剂需浸泡至_________。

被称为“君主之官”的是A:心B:肝C:脾D:肺E:肾

变压器的负序电抗与正序电抗相等。

（2018年真题）烟叶税的税率是（）。A.3％ B.5％ C.20％

下列不属于流通企业物流的是（）。A.生产企业物流 B.批发企业物流 C