versus 有减去这个意思吗? The vent collection system is needed to control the back-pressure on the analyzers and protect the cells of the oxygen analyzers. • The back pressure needs to be absolute pressure controlled versus gauge pressure controlled to ensure analysis results are not affected by changes in barometric pressure. There are two headers connected to the vent collection system, a fast purge header and a cell vent header. 大家帮我校对一下标红句,我怕给人家改错了。 E--C 原译: · 背压必须等于受控绝对压力 减去 受控表压,以确保分析结果不会收到大气压变化的影响。 [ ]查看更多6个回答 . 4人已关注