The quality of test paper is very important to evaluate the ability of the tester, and the grade distribution curve is its main evaluating standard.
试题质量的好坏对评估考生的实际能力非常重要，而考生成绩分布概率曲线是测定试题质量的的最主要标准之一。
Fire rating: H-3 Protection Grade: IP54 it has wide light distribution curve and its prism glass can reduce glace.
灯具防火等级：H - 3防护等级：IP54灯具配光曲线宽，棱晶玻璃罩减少眩光。
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