OSAFn.初始子区字段；始端子域字段OSabbr.操作系统=（Operating System）oscillographic integrator示波积分器oscillating unsteady flow波动不稳定流osmotic pressure gradient渗透压梯度os carpale distale primum大多角骨oscillating flash-board倾倒闸门os carpi radiointermedium桡中间腕骨oscilloscopic polarograph示波极谱oscillatory sample holder振动样品架oscillating jet technique振荡射流法oscillator amplifier unit振荡放大器