Unit 11 Roofing Works Part two Construction of Main Frame
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Unit 10 Quality Control Part two Construction of Main Frame
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灭火器Fire Extinguishers Part two Construction of Main Frame
灭火器Fire Extinguishers
灭火器为加压的容器,设计用于火灾初始阶段的扑救。灭火器内部压力是 为了排出灭火剂，对火灾进行窒息、冷却或化学干预；或者是联合利用 其中两个或以上功效消灭火灾。
A fire extinguisher is a pressurized vessel designed to attack a fire in the e...
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日常练习课 Part two Construction of Main Frame
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