a. It is forbidden to whisper about things that are not related to work, and it is forbidden to do large physical movements on the machine. b. It is forbidden to walk around at will, and to change jobs without the permission of the site leader. c. It is forbidden to sit on the ground or lie on the equipment (except when the engineer is repairing and debugging). d. It is forbidden to open clothes buttons or zippers in a clean room, and scribble on clean clothes, shoes, and gloves is prohibited. Damaged gloves should be replaced immediately. e. It is forbidden for many people to gather together (except for emergencies or meetings). f.It is forbidden to run or make large body movements to avoid causing dust.