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重力是萬有引力引起萬有引力定律:自然界中任何兩個物體都是相互吸引的,引力的大小跟這兩個物體的質量乘積成正比,跟它們的距離的二次方成反比.相同的,重力也就跟物體質量成正比,跟他們之間的距離成反比.由於物體之間…
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