Features 危険物甲種問題集
The definitive edition of the Dangerous Goods Class A problem collection and the Class A countermeasures app!
240 questions carefully selected to the production format.With detailed explanations for all problems.This application "Dangerous goods first problem collection" is free.
You can use all functions and all problems for free.If you want to take dangerous goods, install this free app now!
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24/7 Support
Our dedicated support team is always ready to help you.
Personalization
Customize the app to match your preferences and workflow.
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Available for Android 8.0 and above