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

游客2024-07-24 14

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。

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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

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适合行药物流产的妇女是A:24岁，G1P0，孕40天，伴先天性心脏病 B:41

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