II = Equipment Group " Surface "，亦即地表上區域適用。 此外亦有 I...2為high level。此外1為very high level(最危險)，3為 normal (一般程度危險) G = Gas，即爆發性氣體...
...other words, if purely only will use in the system in the normal condition except the wet process compressor to carry on, therefore possibly...controller and its the man-machine lies between the surface by Simens to match establishes becomes...
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