gas down take是什么意思

用法例句

Two measures taken in boiler aiming at decrease in coal quality;

针对煤质下降问题的两项锅炉改进措施

A comparison experiment between the common flue-cured house with air descend and the improved close flue-cured house was conducted to investigate the flue-cures cost and economic benefit.

以原烤房为基础改成增大容量的密集烤房,采用烤烟品种云烟87为材料,对气流下降式与小型密集烤房的烘烤成本和经济效益进行了对比分析。