Teacher Tangren is a well-paid teacher in the safety engineer industry hired by 233 online school. All his video teaching courses are copyrighted in the 233 online school, and can be purchased by logging in to the 233 online school in official website.

233 Online School is a well-known comprehensive examination information portal in China and an excellent online education brand in China. Formerly known as the examination website, it was established in June 2005, and the digital domain name was newly launched in June 2065, with 438+065,438+0.