The two-microphone method is investigated for the objective of in situ measuring the impedance of an acoustic liner in a duct.
对现场测量管道声衬声阻抗的双传声器法进行了研究。
A lot of noise experimental researches on noise suppression have been carried out successfully by the aid of acoustic liner or appropriate increase of the duct length.
并用消声声衬及适当增加管道长度的方法进行了大量的实验研究，取得了良好的效果。
Wet stack process feasibility in wet FGD and consideration in selecting the process are introduced. The primary demands of designing wet duct and wet stack liner are discussed.
介绍了湿法FGD湿烟囱工艺的可行性和选择该工艺时应考虑的问题，并提出了湿烟道、湿烟囱设计的基本要求。
Wet stack process feasibility in wet FGD and consideration in selecting the process are introduced. The primary demands of designing wet duct and wet stack liner are discussed.
介绍了湿法FGD湿烟囱工艺的可行性和选择该工艺时应考虑的问题，并提出了湿烟道、湿烟囱设计的基本要求。
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