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secondary metal 再用[生]金屬。

secondary planet

Fire safe ? secondary metal - to - metal seal acts as backup if primary seal is destroyed by fire . valves ordered for compliance with api 607 will be provided with graphite packing and gaskets 氯氣應用-可提供能夠滿足氯氣協會第6小冊子所列的全部標準和規定的閥門,包括通風球的預備,流向箭頭,以及為了防止污染而進行的清洗和包裝。