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 app for Hazardous Materials Handler Class B Class 4 and Otsu 4 Countermeasures! There are 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.

Additionally, the "How to study Dangerous Goods 4" page, which explains in detail how to study Dangerous Goods 4, is a must-read. Please take advantage of it!

This app is compatible with the legal revisions as of April 2025. Please use it with confidence.

You can use all the contents of this app, ``Dangerous Goods 4 (Otsuyon) Complete Questions Explanation'', for free.

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This app "Dangerous Goods Otsuyon 4 (Otsuyon) Complete Questions Explanation - 618 frequently asked questions ranging from the basic question and answer to the actual format" is,

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