The definitive version of the app for Hazardous Materials Handler Class B Class 4 and Otsu 4 Countermeasures! Contains 618 frequently asked questions ranging from basic Q&A to the actual format.All questions have detailed explanations. There is also a function that allows you to review the checked questions at once.In addition, a page titled "How to study Dangerous Goods 4" which explains in detail how to study Dangerous Goods 4 is also included. A must-read/must-see. Please use all means!This app, ``Dangerous Goods Otsu 4 All Questions Explanation - 618 carefully selected questions from the basic Q&A to the actual format is free. You can use all functions and all problems for free.A strong ally for acquiring qualifications and studying for exams. If you want to take Hazardous Materials Handler Otsu 4, install this free app now!
危険物乙４（おつよん）全問解説 - 分野別一問一答と過去問
