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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482題

2016-04-03View Original

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単一選択問題:化学工業用の配管において、高い強度と優れた密封性が求められ、かつ取り外しが可能な配管としては、通常( )が使用される。 Aフランジ接続 B嵌合接続 C溶接 Dねじ接続 答え:A フランジ接続

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