paranemic spiral
平行螺旋，反向双股螺旋
Study on Extrusion Modeling of Twin Screw Pulping Extruder Considering Reverse Threads
考虑反向螺旋的双螺杆磨浆机挤压建模
helical curve [ line ]
螺旋曲线螺旋(取向)照相
Approach to the Process of the Discovery of the Structure of DNA Double Helix;
关于DNA双螺旋结构发现过程的再反思
Research on Performance of Dry Gas Seal with Single-row Bidirectional Spiral Grooves
单列双向螺旋槽干气密封的性能研究
a twin-screw cruiser
双螺旋桨的机动游艇.
double torsion machine
双列螺旋弹簧卷绕机
electron-nuclear double resonance helix
电子-核子双共振螺旋管
ectron-nuclear double resonance helix
电子核子双共振螺旋管
double helical (spur) gear
双螺旋齿轮，人字齿轮
spiral part of a screw
（螺钉的）螺旋部分.
Longitudinal Stability of Jet-Propeller Aircraft During Low-Altitude Flight
螺旋桨飞机近地飞行时的纵向稳定性
helical gear with helix angle
带螺旋角的螺旋齿轮
side fire helical antenna
侧向辐射式螺旋形天线
horizontal flow-through coil planet centrifuge for counter current chromatography
水平螺旋管逆流层析仪
HVSS (Horizontal Volute Suspension System)
水平螺旋弹簧悬挂系统
Plane Archimedes spiral antenna
阿基米德平面螺旋天线
Study on Casting Process Numerical Simulation for Grinding Machine of Double Helix Scroll Cover
双螺旋辊式磨浆机螺旋套铸造工艺数值模拟