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当采用阻气袋阻断气源时,应将管线内燃气压力降至阻气袋有效阻断工作...
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带压封堵作业现场应设置安全警戒线,以施工区域为界,区域外()米以内作为隔离区,并在明显的位置设置安全标识,且有人看护。A、10B、15C、20D、25...
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是天然矿石粉+色母+丙烯酸树脂胶经高温、高压处理,质地均匀无毛细...
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