How about the weathervane math in the mid-term exam?

Set sail for the mid-term exam. Wind vane is good at mathematics. According to the public information about the inquiry, Mathematics of Wind Vane in Sailing Test is an excellent mathematics review book, which comprehensively, accurately and systematically combs the knowledge points of this subject, so that students can have a deeper understanding of the test content. In addition, the book also provides a large number of exercises to test students' academic performance.