* This application is a trial version. You can try the trial version until the second day of the 30-day program. You can also try the trial version of the mock test, which starts with about 80 questions. Nice to meet you. If you are reading this text, I think most of you want to pass the Class B Class B Hazardous Materials Handling Examination. Although this application is for smartphones, it is really intended to pass the Class B Class 4 Hazardous Materials Handling Examination. By thoroughly