Hazard Symbols （危险标志）
Many countries require Hazard Symbols labeled on the containers of chemicals . These
symbols have the following meanings:
E: Explosive
O: Oxidizing agent Xn: Harmful F++: Extremely flammable Xi: Irritant F+: Highly flammable C: Corrosive F: Flammable N: Dangerous for the environment T+: Very toxic 
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