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鋼坯的體積是 10×20×50=10000(立方釐米) 圓柱的底面半徑是 20÷2=10(釐米) 圓柱的底面積是 10×10×3.14=314(平方釐米) 圓柱高 10000÷314=31.85(釐米)
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