One Question per Day on Synthetic Ammonia (Series 53)

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I. Multiple-choice questions (Each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets) Continuing from Series 52: 1. In chemical production, operation records must be filled out carefully, and the error rate should be kept below (). A、1% B、2% C、5‰ D、1.5‰ 2、An important indicator for measuring the biodegradability of industrial wastewater is (). A、COD B、BOD C、TOD D、BOD/COD. 3、The ignition limit of gasoline is ( ). A、1～6% B、4.3～19.0% C、12.5～74.2% D、10～20% 4、The type of fire that cannot be extinguished using a carbon dioxide fire extinguisher is ( ) A、Precision instruments B、Electrical equipment C、Metal oxides D、Books and archives 5、When working at heights in a chemical plant’s production area (i.e., at a vertical distance above the ground), it is necessary to wear a safety belt. A、1.5m B、2.0m C、4.0m D、3.0m Answer: DDACD Scoring criteria: 3 points for participation, 1 point for each correct answer