本周全部指定作业 拍照上传到“学习通”作业模块 ,同时 把作业zipped文件发送到 宋老师及 助教学长的QQ邮箱 Note: Please complete all specified homework, and upload all question pictures to 学习通, then send the zipped file to 宋老师 and the teaching asistant 霖 QQ mail box 1 、 p14(2-1 基本立体) Model (1).pdf 完成本页作业第2,4两题 说明: 1 、第2题轴测图暂时不做要求,注意直线AB与底边的平行关系; 2 、第4题线AB的投影及其可见性要格外关注,不要忽略AB和CD在俯视图上的投影;。 Complete questions 2 and 4 Note: 1.Question 2, at present, ignore the isometric drawing requirement, and pay attention to line AB, it is parallel with one bottom line; 2.Question 4, ascertain projection visibility for line AB, and don't forget their horizontal projections