视敏度(visual acuity)
视敏度又称视力,是指眼对物体形态的精细辨别能力,是判断视网膜中央凹视锥细胞功能的指标。以能够识别两点的最小距离为衡量标准。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧