短語詞組短語explosion lower limit density 爆炸下限濃度explosion mixture limit 爆炸界限explosion concentration limit 爆炸濃度極限explosion upper limit 爆炸上限Explosion n limit 爆炸極限EXPLOSION PROOF LIMIT SWITCH ENCLOSURES 防爆極限開關(guān)箱gas explosion limit 瓦斯爆炸極限;瓦斯爆炸界限explosion limit range 易爆范圍l explosion limit 爆炸極限 返回 explosion limit