题目

根据短文内容,用适当的单词的适当形式填空。(C)RouteFlight No.DayDeparture(离开) TimeArrival TimeShanghaiNew YorkF012F018F019MondayTuesdayThursday06:4507:1008:1523:4523:3001:40ShanghaiLondonF021Except(除了)Sunday andThursday09:1021:10ShanghaiParisF001F025F005F002MondayTuesdayWednesdayFriday05:2506:5015:0017:2016:2517:5002:0004:20ShanghaiPusan(釜山)F017F028F011F016F026TuesdayWednesdayThursdaySaturdaySunday17:0008:2006:3005:2014:5019:3010:5009:0007:5017:20PusanShanghaiF027F098F035WednesdayThursdaySaturday10:2006:4017:1012:5009:0019:40根据表格内容，完成下面各题 (理)如图，在直四棱柱ABCD－A1B1C1D1中，底面A1B1C1D1是梯形，且A1B1∥D1C1，A1D1＝D1D＝D1C1＝A1B1＝1，AD1⊥A1C，E是棱A1B1的中点． (1)求证：CD⊥AD； (2)求点C1到平面CD1B1的距离； (3)求二面角D1－CE－B1的余弦值．