What must the laboratory post in a conspicuous place?

1. The sign "No entry for non-staff members" must be posted in the lobby on the first floor of the laboratory building; 2. Signs such as "No fireworks", "Pay attention to safety", "Keep clean" and "Wear experimental clothes" must be posted on the stairs or elevator entrance of each floor of the experimental building; 3. Stairs, corridors, bridges and other areas where waste debris is easy to pile up should be posted with "No Stacking" signs; 4. The sign "Pay attention to the safety of electricity use" must be posted next to the electrical box and main power socket in corridors and laboratories.

Matters needing attention in the experiment: before the experiment, we should know the toxicity and protective measures of the drugs used; Operate toxic gases (such as H2S, Cl2, Br2, NO2, concentrated hydrochloric acid and HF, etc.). ) should be carried out in a fume hood; Vapors such as benzene, carbon tetrachloride, ether and nitrobenzene can cause poisoning. Although they have a special smell, long-term sniffing will weaken people's sense of smell, so they should be used under the condition of good ventilation.