铁矿石

Although outnumbered more than 20:1 by rod photoreceptors, cone cells in the human eye mediate daylight vision and are critical for visual acuity and color discrimination. A variety of human retinal diseases, e.g.

尽管视杆细胞光感受器在数量上以20：1远远超过视锥细胞，然而人类眼中的视锥细胞担负着调节明视觉的重要任务，并对视力和颜色辨别有重要作用。

Based on the analysis of the characteristics of city railcar,the air conditioning,heat load calculation and the condition of indoor comfort are studied.

本文通过分析城市轨道车辆的特点，对其空调热负荷的计算和室内舒适性条件进行了研究，并对如何确定外气温湿度、载客量、室内温湿度、新风量、粉尘含量、微风速等计算参数提出了建议。