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一个生物体由小长大,是由于( )
①他需要再找一块直径是多少分米的圆形铁皮?
②他焊成的水桶最多能装水多少升?
③他焊成的水桶共用铁皮多少平方分米?
=21.32-6.32-8.3
=15-8.3
=6.7