多项选择题What types of information are generally supposed to be included in the introduction section in the report?() A、Background B、Summary of the results and conclusion C、The purpose of the research D、The research method
单项选择题纵墙承重的优点是：A. 建筑整体刚度好B. 房间布局较灵活C. 纵墙上开门、窗限制较少D. 以上全部正确
