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69. No operation records are available, or the records are incomplete. 70. No protective equipment was worn when handling, filling, or transporting corrosive substances. 71. There were instances of operators leaving their posts, being absent from them, or dozing off at work. 72. Dust masks were not worn in areas where powders and other materials were handled. 73. Valves were opened and closed quickly. 74. The bottom valves of layered reactors and tanks were not closed after separation of layers. 75. The water separation valves in layered reactors and tanks were set too wide, resulting in oil mixed with water being discharged into sewage systems; or the valves were forgotten to be closed, causing material leakage. 76. Air was allowed to enter high-temperature reactors and towers. 77. Catalysts such as palladium on carbon and active nickel were scattered around the work area. 78. Iron rods were used to clear blockages in pipes and reactors, or non-explosion-proof tools were used, generating sparks. 79. Ear protection or earplugs were not worn in noisy environments. 80. Storage tanks were used under excessive pressure. 81. In areas where flammable and explosive solvents like gasoline and toluene were used, reactors and tanks were not purged with nitrogen. 82. There was excessive dust, poor ventilation, or oxygen deficiency. 83. The lids of reactors were opened while under pressure. 84. Employees had occupational contraindications, allergies, or had been exposed to toxic substances for too long. 85. Emergency valves and switches were difficult to operate. 86. In flammable and explosive areas, employees wore shoes with nails, high heels, or sandals