2. 外语
  3. What is the most important factor for a rocket to escape from the Earth? Why is it not necessary to provide powered flight in s

What is the most important factor for a rocket to escape from the Earth? Why is it not necessary to provide powered flight in s

admin2009-06-15  105
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 future 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
转载请注明原文地址:https://www.kaotiyun.com/show/Qc2d777K
本试题收录于： 职称英语卫生类基础题库职称英语分类
0

职称英语卫生类基础

职称英语

相关试题推荐
随机试题
最新回复(0)