发现在它们的红移、光学光度以及平均光学- X射线谱指数的直方分布图上，X射线选择类星体统计上都分布在这些参数图的低端。

On the histograms of their redshift, optical luminosity and average optical X-ray spectral index, it is found that X-ray selected quasars are distributed at the low ends of plots of these parameters.

youdao

结论角膜地形图仪系统测量角膜屈光度更为准确、全面，尤其对角膜过陡、过平、有斑翳、云翳者的检测结果更有参考价值。

Conclusions the corneal diopter measured by the topographer was more accurate than that measured by the keratometer, especially for the patients cornea was too steep, flat or corneal opacity.

youdao

两组均于手术后1、3、6、12个月复查视力、屈光度、角膜地形图及角膜上皮下基质混浊等并发症情况。

After surgery, the vision, refraction, corneal topography, corneal haze and other complications of all patients were observed at 1, 3, 6, 12 months.

youdao