One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 517
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Multiple-choice question: When the calcium carbide-based acetylene generation system is shut down, the nitrogen emission from the system is considered acceptable if it contains less than 0.2% acetylene; when the system is started up, the oxygen content in the exhaust gas is considered acceptable if it is less than 3.0%. A、0.2%, 0.5% B、0.2%, 0.3% C、0.5%, 0.3% D、0.5%, 0.5% Answer: B、0.2%, 0.3%
B, 0.2%, 0.3%
B, 0.2%, 0.3%
Qualified. A、0.2%, 0.5%
When the calcium carbide-based acetylene generation system is shut down, the nitrogen emission from the system is required to be below 0.2% acetylene to be considered acceptable; when the system is started up, the oxygen content in the exhaust gas is required to be below 0.3% to be considered acceptable.
B, 0.2%, 0.3%
When the calcium carbide-based acetylene generation system is shut down, the nitrogen emission from the system is required to be within acceptable levels, with acetylene content below 0.2%; when the system is started up, the oxygen content in the exhaust gas is required to be below 3.0% to be considered acceptable. B A, 0.2%, 0.5% B、0.2%, 0.3% C、0.5%, 0.3% D、0.5%, 0.5%