The definitive version of the Dangerous Goods Handler Class B Class 4, Otsu 4 countermeasure app!
240 questions carefully selected to the production format.With detailed explanations for all problems.This application "Hazardous materials Otsu 4 problem collection" is free.
You can use all functions and all problems for free.If you take Dangerous Goods Handler Otsu 4, install this free app now!
https://andro.io/app/dangerous4
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危険物乙4類問題集 for Android – Latest Version & Features
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