duct system短语¹³¹⁶²⁰⁺³ 基本例句 风管网路,风道系统 Based on the good experimental results and the controllability for the degree of water fog, the proposed method is useful in extending the field of active noise control in duct system. 鉴于实验结果的良好性，以及雾化量的可控性，实验的方法可望推广到管道的主动噪声控制中。 cnki