首页
登录
职称英语
What is the most important factor for a rocket to escape from the Earth? ______
What is the most important factor for a rocket to escape from the Earth? ______
游客
2023-10-08
40
管理
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/3082951.html
相关试题推荐
Thecontractisveryimportantforourcompany,solet’s_____thedetailscaref
IntheAmericanfamily,thehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamily,thehusbandandwifeusuallyshareimportantdecision
IntheAmericanfamily,thehusbandandwifeusuallyshareimportantdecision
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
随机试题
Materialculturereferstothetouchable,material"things"--physicalobject
[originaltext]W:Hi,Kaven.YourroommatetoldmethatIcouldfindyouinthe
电压互感器的基本误差有()A.电压误差 B.电流误差 C.角度误差
以下关于三层交换机的叙述中,正确的是()A.三层交换机包括二层交换和三层转
患儿,男,14岁,正畸治疗刚完成,拆除托槽后见多数牙颈部釉质呈白垩色,部分有少量
共用题干 AboutEnd-of-LifeCareDyingpatien
电压互感器高压熔断器更换前后应使用()测量熔断器阻值合格。万用表$;$兆欧表$;
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
甲系某厂司机,某日深夜驾车返回厂里,倒车入库时将偷偷溜进车库过夜的乞丐乙某轧死,
甲国财政支出2017年为351562亿元,2018年为375638亿元,2018
最新回复
(
0
)