【毎日一問】工程基礎知識（判断問題）20190413
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重油温水熱交換器に初めて油を流し込む際は、重油が固まってしまうのを防ぐために、まず温水を流す必要があります。正解
まず水蒸気で予熱し、清掃する。熱水と水蒸気は違います！
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