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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
admin
2009-06-15
86
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
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本试题收录于:
职称英语卫生类基础题库职称英语分类
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职称英语
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