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下列的估测,最接近实际的是( ) A.普通课桌的高度约为80cm B.一个鸡蛋的...
下列的估测,最接近实际的是( )
A.普通课桌的高度约为80cm
B.一个鸡蛋的质量约为500g
C.一位普通中学生步行时的速度约为10m/s
D.一个苹果在地球上受到的重力约为50N
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