危険物取扱者 乙4 【一問一答 分野別 問題解説付き】

Risingluck

It is a problem collection application by field of Otsushi dangerous goods. It is convenient for memorizing when commuting to work or school because explanations are given each time you solve each question in a question-and-answer format. You can use it according to your purpose because it is a point learning and practical problem.