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
2024-07-30
19
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/3697945.html
相关试题推荐
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
TheimmigrantsinAmericaareplayinganimportantroleinthenationalscie
随机试题
DictationListentothepassage.Forquestion21—25,fillintheblankswithth
Duringthesetenyears,manynewmethodshavebeen______inthefieldofforeig
按埋藏条件,地下水的划分不包括()。A.潜水 B.承压水 C.裂隙水 D
陈先生、57岁、公务员、高血压病史15年,服药血压稳定,吸烟、晚餐多为餐馆饮食,
下列关于A型肉毒毒素管理的叙述,错误的是A.A型肉毒毒素制剂由指定的药品批发企业
下颌骨骨折后颌间固定的时间为()A.2~4周 B.4~6周 C.6~8周
下列关于权衡理论的说法中,正确的有()。A.各种负债成本随负债比率的增大而下降
根据经济电流密度曲线,年最大负荷利用小时数越(),经济电流值越()A.大,大
禁止兴建向中华人民共和国海域及海岸( )的中外合资经营企业、中外合作经营企业和
一侧下肺叩诊呈实音,为鉴别是肺实变还是胸腔积液,对诊断最有意义的检查是A.观察肋
最新回复
(
0
)