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What are the protective measures of the three-level biosafety laboratory? The three-level biosafety laboratory can be located in a building with other use houses,But it must be self-contained.The district is separated from public corridors or public parts by isolation doors.2.2 Layout a) the core area of the three-level biosafety laboratory includes the experimental room and the buffer room connected to it.B) the buffer forms a channel into the experiment.There must be two chain doors,When one of the doors opens,The other door is automatically closed.Such as the use of electric chain devices,Both doors must be open when power is out.A secondary dressing can be performed in the buffer room.C) when there is no automatic control device in the ventilation system of the laboratory,The buffer area should not be too large,It should not exceed 1/8 of the experimental area.D) the installation position of class II or Class III biosafety cabinet should be far away from the entrance of the experimental room,Avoid areas w