MACとLELの違いは何ですか？それぞれどういう意味ですか？
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:(MACとLELの違いは何ですか？それぞれの意味は？
これはどこの文字ですか？出典を教えてくれないと、答えようがないよ
可燃性有毒ガス検出 ガス濃度
ああ、見つけた。可燃性ガス規格におけるLEL爆発下限、MAC最大許容濃度だ
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