2级毛片_天天干婷婷_区二区欧美性插b在线视频网站_少妇叫床声_国产剧情v888av_欧美香蕉爽爽人人爽

Experimental personnel should carefully read the experimental guide book before operation, familiarize themselves with the operating procedures and details to avoid major errors or accidents during the experimental operation. Experimental personnel must be familiar with the performance of the instrument and its correct operating methods, prepare the experimental equipment and consumables. Before and after the start and end of the experiment, they must wash their hands with a cleaning agent (such as 70% alcohol aqueous solution). Before the experiment begins, Laboratory personnel must wear clean White coat. If long hair is left, it must be tied well. They should dress neatly at any time during operation. If necessary, they should wear isolation clothing, gloves, work caps and shoe covers. Check whether the ventilation system and surface wind speed are normal.

For the use of instruments and equipment in the Fume hood, the instruments and equipment should be placed as far as possible in the rear of the Fume hood, at least 20 cm away from the front observation window in the Fume hood, so as to ensure safety and achieve ideal operation. Instruments or materials in the Fume hood should be prevented from blocking the exhaust port of the gas deflector behind the Fume hood. When large instruments are used in the Fume hood, the instruments should be placed on the bench, So that the air flows under it. When there is Flammable liquid or gas, do not place electrical equipment or other heat sources in the Fume hood, or let them close to the heat source. This can prevent the liquid with low ignition point from being ignited.