H <sub style="bottom: -0.25em; font-size: 75%; position: relative; vertical-align: baseline;">2</sub>SO <sub style="bottom: -0.25em; font-size: 75%; position: relative; vertical-align: baseline;">4</sub>/H <sub style="bottom: -0.25em; font-size: 75%; position: relative; vertical-align: baseline;">2</sub>O <sub style="bottom: -0.25em; font-size: 75%; position: relative; vertical-align: baseline;">2</sub>型自动喷淋蚀刻样机的研制