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

游客2023-10-06 64

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://www.tihaiku.com/zcyy/3074869.html

相关试题推荐

Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]
Heescapedfromthebattlefieldonly______bythelocalpeople.A、killedB、toki
Whathesays(be)______notimportant.is他说的话并不重要。题中what引导了一个主语从句，后面接单数动词作谓语。
Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapers
Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapersonw
Thepurposeofthispassageismainlytotellus______.[br]Themostimportant
Thepurposeofthispassageismainlytotellus______.[br]Themostimportant
Wehadaroadaccidentlastweekend,butwewere(luck)______toescapeinjury.
Ourfamily(be)______discussinganimportantmatter.are我们全家人正在讨论一个重要的问题。family
Thepolicecaughthim______overthewallofthefactory.A、climbingB、climbedC

随机试题

A:I’mexhausted.Ihadtoworkuntil2o’clockthismorning.B:______.A、Don’t
Heexpressed______onthenewstyleofwritingwhichisnowquitepopularonthe
Say______whatyoumeanandthentherewillbenomisunderstanding.A、casuallyB
Forthispart,youareallowed30minutestowriteashortessayonthetopicHo
使用程序设计的控制结构导出测试用例的测试方法是（）。A.黑盒测试 B
对发行人而言，发行存托凭证能够带来的好处有（） 1、市场容量大，筹资能力强
近年国内外一致认为脑瘫的主要病因是A.早产和低出生体重 B.脑缺氧缺血 C.
A. B. C. D.
购买保险产品意味着签订了具有法律效应的合同，具有()的特点，一旦签订保险合同，不
患者女，26岁。月经周期为30天，其末次月经是2003年4月18日，其排卵日期大

最新回复(0)

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

Accordingtothepassage,Indiannameswereimportantbecausethey______.[br]

Heescapedfromthebattlefieldonly______bythelocalpeople.A、killedB、toki

Whathesays(be)______notimportant.is他说的话并不重要。题中what引导了一个主语从句，后面接单数动词作谓语。

Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapers

Mannersareimportanttohappyrelationsamongpeople.Everyonelikesapersonw

Thepurposeofthispassageismainlytotellus______.[br]Themostimportant

Thepurposeofthispassageismainlytotellus______.[br]Themostimportant

Wehadaroadaccidentlastweekend,butwewere(luck)______toescapeinjury.

Ourfamily(be)______discussinganimportantmatter.are我们全家人正在讨论一个重要的问题。family

Thepolicecaughthim______overthewallofthefactory.A、climbingB、climbedC

A:I’mexhausted.Ihadtoworkuntil2o’clockthismorning.B:______.A、Don’t

Heexpressed______onthenewstyleofwritingwhichisnowquitepopularonthe

Say______whatyoumeanandthentherewillbenomisunderstanding.A、casuallyB

Forthispart,youareallowed30minutestowriteashortessayonthetopicHo

使用程序设计的控制结构导出测试用例的测试方法是（）。A.黑盒测试 B

对发行人而言，发行存托凭证能够带来的好处有（） 1、市场容量大，筹资能力强

近年国内外一致认为脑瘫的主要病因是A.早产和低出生体重 B.脑缺氧缺血 C.

A. B. C. D.

购买保险产品意味着签订了具有法律效应的合同，具有()的特点，一旦签订保险合同，不

患者女，26岁。月经周期为30天，其末次月经是2003年4月18日，其排卵日期大