One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； July 15th
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Single-choice question: When performing blind plate removal and installation using the calcium carbide method in flammable and explosive areas, no hot work shall be carried out within _______ meters of the work site, and operational lighting must be used_______； Explosion-proof tools must be used; it is prohibited to strike pipelines, equipment, flanges, etc. with iron tools. A、30, ordinary lighting fixtures; B、25, ordinary lighting fixtures; C、30, explosion-proof lighting fixtures; D、25, explosion-proof lighting fixtures. Answer: C、30, explosion-proof lighting fixtures
When performing blind plate removal and installation using the calcium carbide method in flammable and explosive areas, no hot work shall be carried out within ___C____ meters of the work site, and ____C** must be used for lighting___； Explosion-proof tools must be used; it is prohibited to strike pipelines, equipment, flanges, etc. with iron tools. A、30, ordinary lighting fixture B、25, ordinary lighting fixture C、30, explosion-proof lighting fixture D、25, explosion-proof lighting fixture