危険物乙４（おつよん）全問解説 - 分野別一問一答と過去問

The definitive version of the Otsu 4 countermeasure app! There are 618 questions that often appear, from basic one-question answers to production format. If you want to take Dangerous Goods Handler Otsu 4, install it now!

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!