毎日1問、正解者には6つの富を報酬として、参加者には2つの富を報酬として与えます；第467題
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単一選択問題：蒸気は化学工業の生産において欠かせないエネルギー源であり、蒸気の輸送過程において逆流防止弁は配管の（ ）に設置される。 A 最低点 B 管段上 C 最高处 答え：A 最低点
A最低点 ~~~~~~~~~~
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