【毎日一問】工程基礎知識（選択問題）20200108
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スチームリフターはBに属する。 A、精留段のみの不完全な塔 B、抽出段のみの不完全な塔 C、精留段と抽出段の両方がある完全な塔 D、A、B、C、いずれも可能性がある
B、抽出段のみの不完全な塔
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