一般的な極度に危険な（第4級）媒体にはどのようなものがありますか？
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一般的な極度に危険な（第4級）媒体にはどのようなものがありますか？
溶剤ガソリン、プロピレン、水素、水酸化ナトリウム、テトラフルオロエチレン、アンモニア
一般的にはHGT20660-2000を参照し、よく見られるのは塩化ビニルです
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