The natural precipitation method was performed for 10-minute exposure, and the impacting method was performed by FA-1 airborne bacteria sampler at flow rate of 28.3 L/min for 1 min, 10 min and 15 min.是什么意思_The natural precipitation method was performed for 10-minute exposure, and the impacting method was performed by FA-1 airborne bacteria sampler at flow rate of 28.3 L/min for 1 min, 10 min and 15 min.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句