短語詞組短語converging -diverging nozzle 縮擴噴嘴;收縮;收縮擴張噴管Converging -Diverging Nozzle Flow 漸縮及漸擴流Nozzle diverging 放射管嘴diverging parts of the nozzle 噴管擴散部分 返回 diverging nozzle