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参加報酬：2財富。正解の報酬：8富 單一選択問題：暖房用給湯ボイラーの補水には、（ ）を使用すべきである。 A、硬水 B、処理済みの水 C、水質に関係なく処理不要 D、水道水 B
暖房用給湯ボイラーの補水には（B）を使用すべきです。 A、硬水 B、処理済みの水 C、水質に関係なく処理不要 D、水道水
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