那时候，牙科学刚起步，拔牙都不打麻药。In those days, dentistry was basic. Extractions were carried out without anaesthetic.他用过麻药,现在仍眩晕无力.He's still groggy from the anaesthetic.局麻药溶液中加入肾上腺素,使血管收缩.The addition of epinephrine to local an...
采用这项技术可以从矿石浸出液制备钇富集物.The mentioned technology can be used for producing yttrium concentrate from ore leaching liquor.针对地浸矿山潜水泵提升浸出液的特点,研制了车载式电动提放潜水泵装置.The design sand pump for mine is discussed , and the method of increa...