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Acceptable level of Safety.
可接受的安全等级.
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Valves with threaded - in strength welded seats offer an additional level of safety against fugitive emissions.
带有螺纹旋进强度的焊接阀座能够为短时排放提供更高水平的安全性能.
To achieve a level of safety excellence that results in an injury - free work site.
为了达到无一伤亡工地的卓越安全水平.
安全水平???
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