One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 278
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Fill-in-the-blank: Vinyl chloride does not have a distinct melting point; it begins to soften when heated to ______； It becomes leathery and changes color due to decomposition at temperatures above ______ ； Flow begins at 180°C ； It is approximately at _________ that it can be fully decomposed, meaning it can go both up and down. Answer: 80--85℃ ； 130℃ ； 200℃
Fill-in-the-blank: Vinyl chloride does not have a distinct melting point; it begins to soften when heated to _75~80°C_； Above __130℃_, it becomes leathery while decomposing and changing color ； Flow begins at 180°C ； It decomposes completely at around __200℃_, both above and below this temperature.
Vinyl chloride does not have a distinct melting point; it begins to soften when heated to __80–85°C__； Above __130℃____, it turns leathery while decomposing and changing color ； Flow begins at 180°C ； It decomposes completely at around _____200℃____, either when heated or cooled.
Vinyl chloride does not have a distinct melting point; it begins to soften when heated to __80°C–85°C__； Above ____130℃__, it becomes leathery while decomposing and changing color ； Flow begins at 180°C ； It decomposes completely at around ___200℃____, either when heated or cooled.
Vinyl chloride does not have a distinct melting point; it begins to soften when heated to __80°C-85°C____； Above ___130℃___, it turns leathery while decomposing and changing color ； Flow begins at 180°C ； It decomposes completely at around ___200℃____, either when heated or cooled.
Vinyl chloride does not have a distinct melting point; it begins to soften when heated to __80°C–85°C__； Above ____130℃__, it becomes leathery while decomposing and changing color ； Flow begins at 180°C ； It decomposes completely at around ___200℃____, either when heated or cooled.
80–85°C 130°C 200℃
80--85℃ 130℃ 200℃
80–85°C, 130°C, 200℃
Answer: 80–85°C, 120°C, 200°C. Note: The question is incorrect; it should be that polyvinyl chloride does not have a distinct melting point, and it begins to soften when heated to ______ ； It becomes leathery and changes color due to decomposition at temperatures above ______ ； Flow begins at 180°C ； It is approximately at _________ that it can be fully decomposed, meaning it can go both up and down.
Answer: Vinyl chloride does not have a distinct melting point; it begins to soften when heated to _(80-85 degrees)__； Above _（130 degrees）_, it turns leathery while decomposing and changing color ； Flow begins at 180°C ； It occurs around __(200 degrees)__; when it can go up and down, it is completely decomposed