Warning: file_put_contents(): Only 0 of 6519 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 vacuum sampling tube是什么意思，vacuum sampling tube的翻译，vacuum sampling tube音标、读音、用法和例句_沉淀汉英词典
It is necessary to solve openning-tube sampling problem for the mass-spectrometer analysis of residual gases in sealed vacuum devices. 密封真空器件内残气的质谱分析，必须解决开管取样技术问题。