OSNR光信噪比OSabbr.操作系统=（Operating System）os turbinatum ventrale下鼻甲Osmoregulation ability渗透调节Osbeckia rhopalotrichan.棍毛金锦香Oscillatoria subanoenan.盐生颤藻oscillating weight cam自动锤凸轮oservability condition可观测性条件oscillator instability振荡器不稳定度oscillograph recording示波器记录oscillating cup method回转振荡法os metatarsale tertium第三跖骨