One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 318
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Fill-in-the-blank: In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is _______, the concentration of dilute acid is _______, and the acid concentration in the washing tower is _______. Answer: 31%±2 ； 19–22% ； ≤8%
(≥31%)-----(22%---24%)-----(≤8%)
In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is 31%±2, the concentration of dilute acid is 19–22%, and the acid concentration in the water washing tower is ≤8%.
In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is __≥31%__, the concentration of dilute acid is ___22%~24%____, and the acid concentration in the washing tower is ≤8%.
Greater than or equal to 31%, 22-24%, less than or equal to 8%
31% 19—22% ≤8%
Fill-in-the-blank: In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is greater than or equal to 31%, the concentration of dilute acid is _22-24%, and the acid concentration in the washing tower is ≤8%.
31%±2； 19–22% ； ≤8%
31%±2； 19–22% ； ≤8%
In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is __31%±2____, the concentration of dilute acid is ___19–22%____, and the acid concentration in the water washing tower is ≤8%.
In the vinyl chloride production system using the acetylene method, the acid concentration below the foam combined tower is _≥31%______, the concentration of dilute acid is _22%–24%______, and the acid concentration in the washing tower is ≤8%.