A collection of 226 questions for the Class 4 Hazardous Materials Handler (乙種) examination. It follows the actual exam format (five-choice multiple-choice questions). It covers the important points of each field and focuses on frequently appearing question patterns. Structure of the Question Collection: Chapter 1: Laws and Regulations Concerning Hazardous Materials (100 questions) Chapter 2: Basic Physics and Basic Chemistry (63 questions) Chapter 3: Properties of Hazardous Materials, Fire Prevention, and Extinguishing Methods (63 questions) Please use this for your exam studies.