Three-dimensional tetragonal space structured with the letter d.

以字母d构造出立体的四方结构空间。

Analysis of the tetragonal tool rest electrical apparatus fault on cnc machine tool .

数控机床四方电动刀架电器故障分析。

Properties and microstructure of nano-powder 3 mol % yttria stabilized tetragonal zirconia polycrystal as dental materials .

牙科纳米材料摩尔分数为3%氧化钇稳定的四方多晶氧化锆性能及其微观结构。

The experiment results indicate that the films are multi-crystal , and the tetragonal is dominant . With the oxygen partial pressure increasing , the crystalline , refractive index and weak absorption are all decreasing .

实验结果表明，薄膜中晶粒主要是四方相为主的多晶结构，并且随着氧分压的增加，结晶度、折射率以及弱吸收均逐渐降低。