【Learn Ethylene Together】Five questions per day to easily learn about ethylene 16

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【Learning Ethylene Together】Five questions per day to easily learn about ethylene. 16 76. During the heating process of the cracking furnace, there are four temperature stages, namely ( ), ( ), ( ), and ( ). 77. Generally, ( ) valves are used to regulate gases and liquids with low pressure differences and high flow rates, while ( ) valves are suitable for regulating highly corrosive fluids. 78. Chemical automation systems generally include ( ) systems, ( ) systems, ( ) systems, and ( ) systems. 79. The characteristic parameters that indicate the quality of the feedstock for cracking mainly include ( ), ( ), ( ), ( ), and ( ). 80. The physical properties that characterize the feedstock for cracking mainly include ( ), ( ), ( ), ( ) 등. 76. During the heating process of the cracking furnace, there are four temperature stages, namely ( ), ( ), ( ), and ( ). 200℃ 400℃ 600℃ 760℃ 77. Generally, to regulate gases and liquids with a low pressure difference and high flow rate, ( ) valves can be used; to handle highly corrosive fluids, ( ) valves are suitable. Butterfly diaphragm valve 78. Chemical automation systems generally include ( ) systems, ( ) systems, ( ) systems, and ( ) systems. Automatic detection, automatic signal interlocking, automatic operation, automatic adjustment. 79. The characteristic parameters that indicate the quality of the materials used for cracking include ( ), ( ), ( ), ( ), and ( ). Family composition (PONA), characteristic factor (K), aromatic hydrocarbon index (BMCI), physical properties, content of chemical impurities such as arsenic and lead. 80. The physical properties of pyrolysis feedstocks are mainly represented by ( ), ( ), ( ), ( ) etc. Density, boiling point, gel content, viscosity