straight taper shank twist drill

The experimental research on high narrow draft tubes with several different conical tube height has been made.

论述了窄高型尾水管配用不同高度直锥管的试验研究成果，对直锥管的有利高度进行了有益的探讨。

To improve the relatively great loss of normal Y branch optical splitter,the straight tapered waveguide instead of traditional straight waveguide is adopted to minish the size of components,and a new low-loss 1×3 optical splitter of three cascaded branches is used.

针对传统Y分支光分路器损耗较大的缺陷,采用直锥形波导代替传统的直波导来减小器件的尺寸,并且采用激模波导结构设计1×3分支波导。