2) double helical vortexes tubes
双螺旋涡管
3) dual tube auger
双管螺旋钻
1.
Referring the conventional used hollow stem auger in America,the authors designed a kind of dual tube auger which combines the functions of both the conventional dual tube rock auger and the continuous flight soil auger.
为了满足非饱和黄土连续原状取芯的要求,参考美国已成熟的螺旋空心钻技术,设计了一种双管螺旋钻具。
4) double spiral duct
双层螺旋风管
1.
Discussion on the construction of double spiral duct in large space buildings;
大空间建筑双层螺旋风管施工工艺探讨
5) double pitch auger
双螺距螺旋
6) double wall screw ripple pipe
螺旋双壁波纹管材
1.
The structure, advantage, production technology equipment, conjunction of double wall screw ripple pipe of metal reinforcement for underdrainage were presented.
介绍埋地排水用金属增强螺旋双壁波纹管材的结构、优点及生产工艺、生产设备 ,管材的连接等 ,通过与现有结构壁管的比较 ,说明了埋地排水用金属增强螺旋双壁波纹管材在市场中的竞争优势和应用前景的广
补充资料：UR-9双螺杆式空气压缩机
UR-9双螺杆式空气压缩机
I甲之一9双螺杆式空气压缩机翻戳
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条