首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What is the most important factor for a rocket to escape from the Earth? ______ Why is it not necessary to provide powered flig
What is the most important factor for a rocket to escape from the Earth? ______ Why is it not necessary to provide powered flig
admin
2009-05-28
41
问题
What is the most important factor for a rocket to escape from the Earth? ______
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://kaotiyun.com/show/3ywK777K
本试题收录于:
大学英语三级B级题库大学英语三级分类
0
大学英语三级B级
大学英语三级
相关试题推荐
通过食用含有维他命C的食物和含铁的食物,铁的吸收显著增长。(alongwith)
ReadthefollowingpassageandJillineachblankwithoneword.Choosethecorrectwordinoneofthefollowingthreeways:acc
AtopracehorsewasbroughtdownatRoyalAscotwithashotfromahigh-techsoundgun,acourtwastoldyesterday.Thegunwas
Genealogy,thestudyoffamilyhistory,isthesecondmostpopularhobbyinAmericatoday.MillionsofAmericans【C1】sp______the
Haveyoueverthoughtaboutit?Haveyoueverwondered,"WhatisthepriceImustpaytoliveahealthylife?"Mostofuswantt
Otherstudentshadpoorerexamresults—heisbynomeans______intheclass.
Theflowchartbelowshowshowchocolateismade.Summarisetheinformationbyselectingandreportingthemainfeaturesandmake
Oneafternooninthesummerof1989,a27-year-oldfoodtechnologist,calledHelenSharmanhappenedtobelisteningtotheradio
Mysisterisstudyingabroadforher(doctor)_______degreeinphysics.
______theflood,theshipwouldhavereacheditsdestinationontime.
随机试题
根据我国《公司法》的规定,公司是其以_____对外承担责任的。()
A.呕吐清水痰涎B.呕吐黏痰黄水C.呕吐物酸臭D.呕吐脓汁实热证则表现为
女性,28岁。面颊部、指末端及甲周出现暗红色斑1个月,四肢关节痛伴持续性发热10天。实验室检查:WBC3.5×109/L,Hb87g/L,ESR54mm/L,尿蛋白(++)。本病可能的诊断为
已知年名义利率r,每年计息次数m,则年有效利率为( )。
以下说法中,不符合《旅游区(点)质量等级的划分与评定》规定的是()。
会议通讯服务力求()
2011年我国全部工业增加值188572亿元。规模以上工业增加值增长13.9%。在规模以上工业中,国有及国有控股企业增长9.9%;集体企业增长9.3%,股份制企业增长15.8%,外商及港澳台商投资企业增长10.4%;私营企业增长19.5%。轻工业增长13.
在表和文中提到“裔族”①、“亚裔”②和“各亚裔”③的意思是:对文中所说的“在某些地区的大专课程中,亚裔就读生占本裔86%,白人为64%……”里的百分数该怎样理解?这里说明了什么问题?判断正确的是:
设p(x)在[a,b]上非负连续,f(x)与g(x)在[a,b]上连续且有相同的单调性,其中D={(x,y)|a≤x≤b,a≤y≤b},判别I1=(x)f(y)p(y)g(y)dxdy的大小,并说明理由.
JudithVogtli,directorofanupstateNewYork-basedabstinence(thepracticeofrefrainingfromsex,alcohol,etc)organization
最新回复
(
0
)