(09湖南娄底).对物理量的估测,是一种良好的学习习惯,也是学

09湖南娄底).对物理量的估测,是一种良好的学习习惯,也是学好物理的基本功之一。小明是一位发育正常的九年级学生,下列是与他有关的一些数据,你认为合理的是

A.他的体重为150N                                      B.他身体的平均密度约为10×103kg/m3C.他的手掌宽度为25cm                               D.他百米赛跑的速度可达20m/s

答案

答案:B

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