Global Vocational Education Online was established in 2003. In the past eleven years, online schools have experienced rapid development. Reach cooperation with well-known educational travel network. There are nearly 100 online tutoring courses in seven categories, such as engineering, foreign languages, accounting, economy and trade, medicine and health, academic qualifications and national vocational qualifications, and the courses are uploaded for more than 10000 hours every year. Global Online School has become the largest distance vocational education institution in China. Global Online School has a unique teaching mode, in which the class teacher follows every student all the way, communicates in real time, and solves the educational or service problems encountered by students in the learning process. The head teacher can also help students customize their study plans and provide study suggestions. Dear friends, if you can't understand the specific knowledge points in your study, you won't answer the exercises. Please ask them in the question and answer center, and a more professional teacher will answer them for you.