Concrete mixing and unloading mainly depend on the two spiral mixing leaves, so the design of the helical mixing blades is particularly important.
混凝土的搅拌和卸载主要依靠两个螺旋搅拌叶片，因此螺旋搅拌叶片的设计尤为重要。
2
He points out that a similar spin-filtering of photons due to Bragg diffraction has been seen in cholesteric liquid crystals, which also have a helical structure.
他指出，由于布拉格衍射效应，在同样具有螺旋结构的胆甾相液晶中也观察到了类似的光子自旋滤波。
3
The Gorlov Helical Turbine, as it is known, allows you to use any stream, whatever the direction of its flow.