问题
选择题
_________with the size of the whole earth, the biggest ocean does not seem big at all. [ ]
A. Compare
B.When comparing
C. Comparing
D.When compared
答案
答案：D
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_________with the size of the whole earth, the biggest ocean does not seem big at all. [ ]
A. Compare
B.When comparing
C. Comparing
D.When compared
答案：D
抛出一个小球，测得小球经时间t落回抛出点，已知该星球半径为R，万有引力常量为G，求：