1)homologous duplex,同源双螺旋2)plectonemic coil,同向双股螺旋;相缠螺旋3)double helix tooth synchronous belt,双螺旋齿同步带4)bi-raw and single direction spiral grooves,双列同向螺旋槽5)plectonemic coiling,同向双股螺旋6)64-slice dual source CT,64排双源螺旋CT
用法和例句
This paper introduced the new type synchronous belt——double helix tooth synchronous belt,and analyzed molding principle of double helix tooth synchronous belt and belt wheel,and concluded the geometry equation of the mesh of the belt tooth and belt wheel,it established the theory base for the application of practice engineering.