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John is doing hie homework in his bedroom now.(改为否定句)做一节长一米,直径12厘米的圆柱形烟囱,至少要( )平方厘米的铁皮

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John is doing hie homework in his bedroom now.(改为否定句)
做一节长一米,直径12厘米的圆柱形烟囱,至少要( )平方厘米的铁皮
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John is not doing his homework in his bedroom now
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