预真空 meaning in Chinese

fore vacuum
forevacuum
forvacuum
preliminary vacuum

There are great variety in the 13 series of labeling machines , computer vision empty bottle inspection systems , and multifunction pre - vacuum filling machines dy produced . dy has also been the first in the field for several times , eg . the first to produce " double sided four label labeling machine " and " digital control labeling machine "
所生产的十三个系列的贴标机机器视觉空瓶验瓶机多功能系列的预真空灌装机，规格品种全，并在国内率先推出"双面四标机"和"数控四标机"等多个国内"第一" ，产品畅销全国，广受好评。