Vendeur : liu xing, Nanjing, JS, Chine
paperback. Etat : New. Paperback Pages Number: 33 Language: Chinese. Who is faster then? All moving objects have speed. Compare the speed. even the naked eye can not distinguish. but there are differences in speed. We take a look at Santa Claus and the red nose deer racing to study and compare the speed of the method by measuring their running speed. Please pay attention to those around us at various speeds and compare them. N° de réf. du vendeur N70369
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