Answering Exams

Traffic policemen on duty at busy street crossings during heavy traffic rush hours are advised to use:__________?

Traffic policemen on duty at busy street crossings during heavy traffic rush hours are advised to use:__________?

A. Hydrogen tank
B. Nitrogen tank
C. Oxygen tank
D. None of these

Traffic policemen on duty at busy street crossings during heavy traffic rush hours are advised to use oxygen tanks in developed countries

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