请在下列数据后面补上合适的单位．一名同学的高度是16.4；成年人正常步行的速度为1.2；一只普通鸡蛋的质量大约是70．

问题描述：

请在下列数据后面补上合适的单位．一名同学的高度是16.4______；成年人正常步行的速度为1.2______；一只普通鸡蛋的质量大约是70______．

最佳答案：

①成年人的身高在170cm左右，中学生的身高接近成年人，在164cm=16.4dm左右；
②成年人正常步行的速度在4km/h=4×

3.6

m/s≈1.2m/s左右；
③8个鸡蛋的质量大约1斤，而1斤=500g，所以一个鸡蛋的质量在65g左右，接近70g．
故答案为：dm；m/s；g．

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