Lecture, 4 credits, 5 hours per week. Pre-requisites: MA127 Calculus II ，PHY106 College Physics II，MA113 Linear Algebra.This course aims to introduce how to use mathematics as a tool & technique to deal with engineering problems. From the course, students should transform from learning pure mathematics to using mathematics solve actual engineering problems. Master functions of a complex variable, ordinary and partial differentials closely related to physical problems and special functions. Master using the residue theorem to calculate definite integrals; improve abilities in abstract thinking and symbolic analysis.