Daily Safety and Fire Prevention Question (12.1)

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1. Foam fire extinguishing systems are classified into low-expansion, medium-expansion, and high-expansion foam fire extinguishing systems based on their expansion ratio. The expansion ratio of high-expansion foam extinguishing agents is (　　). A. 101–1000 times B. 201–1000 times C. 301–1000 times D. 401–1000 times. 2. The explosion of flammable gases generally requires three conditions: the flammable gas itself, air or oxygen, and a source of ignition. However, certain flammable gases can explode even in the absence of air or oxygen; this phenomenon is known as decomposition explosion. Among the following groups of gases, those that can all undergo decomposition explosions are (　　). A. Acetylene, ethylene oxide, methane B. Acetylene, ethylene oxide, tetrafluoroethylene C. Acetylene, methane, tetrafluoroethylene D. Ethylene oxide, methane, tetrafluoroethylene Reference: 1.B 2.B