【毎日一題 第230題】2020年8月14日
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【毎日一題 第230題】2020年8月14日、内径が50mmで壁厚が3.5mmのシームレス鋼管は、φ50mm*3.5mmと表せる。 判断問題（） 2日以内に解答してください。
エラー。 内径が50mm、壁厚が3.5mmのシームレス鋼管は、φ57mm*3.5mmと表記できます。
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