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参加報酬：2富。正解の報酬：8財富 単一選択問題：亜鉛メッキ鋼管の規格にはDN15、DN20などがあり、DNは（ ）を表します。 A：内径 B：公称直径 C：外径 D：その他 B
亜鉛メッキ鋼管の規格にはDN15、DN20などがあり、DNは（A）を表します。 A：内径 B：公称直径 C：外径 D：その他
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