【毎日一題】2017.10.31
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化学工業の生産において、配管とバルブの接続には一般的に___接続が用いられます。 A、フランジ B、溶接 C、嵌合式 D、ねじ 答え：A
化学工業の生産において、配管とバルブの接続には一般的に__A_接続が用いられます。 A、フランジ B、溶接 C、承挿式 D、ねじ
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