2000個/100平方センチメートル、なぜこの単位を使うのか？
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なぜこの単位を使うのか？2000メッシュ/100平方センチメートル、なぜ20メッシュ/平方センチメートルを使わないのか
密目式安全網はこのように書かれており、この規格を調べればいいのです
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