回风流 meaning in Chinese
return current
Examples
- Must check gas above all , must discharge by the regulation when gas is accumulative , answering only tasteful in gas chroma does not exceed 1 , 0 , carbon dioxide chroma does not exceed 1 , 5 , air composition accords with regulations when the 100th requirement , ability works
必须首先检查瓦斯，当瓦斯积聚时必须按规定排放，只有在回风流中瓦斯浓度不超过1 、 0 ，二氧化碳浓度不超过1 、 5 ，空气成分符合规程第一百条要求时，才能作业。