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【单选题】
已知地球的半径为 R ,质量为 M .现有一质量为 m 的物体,在离地面高度为 2R 处.以地球和物体为系统,若取地面为势能零点,则系统的引力势能为();若取无穷远处为势能零点,则系统的引力势能为().A.
B.
C.
D.
以上答案都不对
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举一反三
【单选题】The author implies that scientists who regard the notion of a final state of truth without skepticism are Ⅰ. More arrogant or unimaginative than scientists who see science as a perpetual process Ⅱ. Vi...
A.
Ⅰ only
B.
Ⅱ only
C.
Ⅰ and Ⅲ only
D.
Ⅱ and Ⅲ only
E.
Ⅰ, Ⅱ, and Ⅲ
【简答题】It's an _____(absolutely) truth that God will help the one who helps himself.
【单选题】_______know the truth about it will tell you.
A.
Who that
B.
That
C.
anyone who
D.
all those who
【单选题】In Aristotle’s words, who is more to the truth than historian?
A.
painter
B.
poet
C.
playwright
D.
philosopher
【简答题】Those who uphold truth have a strong s 2 of responsibility.
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