Warning: file_put_contents(/www/wwwroot/ppbbu/80125.cn/cache/4ef4d772fd4cbc066fc245d55a866e77.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/80125.cn/index.php on line 58 vacuum sampling tube例句_vacuum sampling tube英汉例句_vacuum sampling tube双解例句_食材铺反向词典
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。