[多选题]Why are trade fairs so attractive to exhibitors and visitors?()H23答案窝(daanwo.com)-大学生作业答案及考资分享平台 Amore customers, less timeH23答案窝(daanwo.com)-大学生作业答案及考资分享平台 Bpersonal contact and receptivityH23答案窝(daanwo.com)-大学生作业答案及考资分享平台 Ctravel for freeH23答案窝(daanwo.com)-大学生作业答案及考资分享平台 Dhigher return on investment