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圓錐形零件體積:1/3×3.14×(40/2)×(40/2)×30=12560立方釐米 直徑為20釐米的圓柱形鋼材底面積是:3.14×(20/2)×(20/2)=314平方釐米 需要截取:12560÷314=40釐米
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