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真空容器の真空度が620mmHgを超える場合、その容器のフランジの公称圧力等級として選べるのは（ ）A、0.25MPa B、0.6MPa C、1.0MPa この問題の正解はCです。
C、1.0MPaなら問題ないはずです。
なぜCを選んだのかわかりません。Cを選んだ理由を説明していただけますか？よろしくお願いします
HG20583-7.1.5条
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