屋面防水保温施工:必修课程的英语怎么说?
来源:百度文库 编辑:杭州交通信息网 时间:2024/05/06 02:28:13
compulsory course
compulsory course
required course, obligatory class
required course
必修课compulsory course
required course
选修课是elective
compulsory course
选修课就是opetional course
compulsory course
required course, obligatory class