Da: liu xing, Nanjing, JS, Cina
paperback. Condizione: New. Paperback. Pub Date: 2015-06-01 Pages: 84 Language: Chinese Publisher: Jiangsu Phoenix Children's Publishing traditional port operator mental arithmetic training using a large amount of questions tactical training. repeat the exercise. do not speak the way they talk about speed. so that the children feel dull. adding to the burden on everyone. Practice has proved that improve the port operator mental arithmetic can not rely on quick surprise. but to go through a gradual. long-term training pr. Codice articolo CX033421
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