请帮忙翻译Nitrogen-trace gas test 和Air-soap test? as with any piece of thermal equipment, the exchanger should be brought to or from operating or derime conditions slowly. 和其他热设备一样,这个换热器应该缓慢升到操作温度下,并从操作温度下缓慢冷却. 什么是nitrogen-trace gas test 和air-soap test? 就是气密试验.试验介质是氮气,检查是用肥皂水而已.查看更多