score block score problem primary school mathematics addition and subtraction arithmetic demonstrator student thinking expansion teaching aids_青华科教仪器有限公司

score block score problem primary school mathematics addition and subtraction arithmetic demonstrator student thinking expansion teaching aids

score block score problem primary school mathematics addition and subtraction arithmetic demonstrator student thinking expansion teaching aids

分数块分数问题小学数学加减算数演示器学生思维拓展教学教具

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CTN Size: 42 × 32 × 32 cm

G.W./CTN:11 kg

QTY/CTN:48 piece/carton

Update time：20250822092348