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答えを求めています

2020-05-03View Original

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球形タンクの溶接欠陥の修理を行う際、溶接部内の欠陥はカーボンアークガスグラインダーを用いて除去できるが、その深さは()を超えてはならない。 A.球殻板の公称厚さの5% B.2mm C.球殻板厚さの2/3 D.3mm 正解を教えてください

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