OSNR光信噪比OSabbr.操作系统=（Operating System）Osmunda vachellii HOOkosmotic pressure ratio渗(透)压比osmium sodium chloride氯锇酸钠oscillatocapacitograph振荡式人体电容记录器oscillatory excitation振荡激发osphorescence spectrum磷光谱Oscillatoria lacustrisn.湖泊颤藻Oseen rs approximation奥森近似式oscillating combustion燃烧振动Osmunda japonica Thund紫萁