断熱層の厚さ
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断熱層の厚さH100、この100は半径の厚さを指すのでしょうか、それとも直径の厚さを指すのでしょうか？
管外側から外側の厚さ、片側の厚さ
半径厚さ。 円でなければ、半径はどこから来るのか？
あなたの言う通り、半径と厚さということであれば、外径57の管に断熱層を被せた後の直径は257になります。
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