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  3. What is the most important factor for a rocket to escape from the Earth? How fast will a rocket go to escape completely from th

What is the most important factor for a rocket to escape from the Earth? How fast will a rocket go to escape completely from th

admin2009-06-15  63
问题 What is the most important factor for a rocket to escape from the Earth?
How fast will a rocket go to escape completely from the Earth’s gravity?
选项 A、Seventy miles per second.
B、Seven thousand miles per hour.
C、Twenty-five thousand miles per second.
D、Twenty-five thousand miles per hour.
答案D
解析
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