题目内容
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[主观题]
In order to escape from the earth, a heavier object ______.A．demands a greater initial spe
In order to escape from the earth, a heavier object ______.
A．demands a greater initial speed than a lighter one
B．demands as great an initial speed as a lighter one
C．must be made lighter than its original weight
D．has to overcome a greater gravity than a lighter one
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