spiraln.螺旋；螺旋形之物；不断恶化、增加或减少v.螺旋移动；盘旋上升；不断恶化、增加或减少adj.螺旋形的；盘旋的spiral cam螺旋凸轮,圆柱螺线凸轮

1. A novel piezoelectric type nozzle flapper hydroelectric servo valve was developed and its control method was researched.
   摘要提出了一种新型压电晶片型喷嘴挡板式电液伺服阀，并对其控制方法进行了研究。
2. And what is more, for different nozzles, the length and width of the bubble cloud of the convergent-divergent nozzle are longer than those of the convergent-straight nozzle.
   另外对于不同类型的喷嘴，缩放型喷嘴产生的空泡云长度比收敛型喷嘴所产生的长。