A:to have;you to be
B:having;that you being
C:to have;you are
D:having;that you are
(Ⅰ)证明:平面PAD⊥平面ABFE;
(Ⅱ)求正四棱锥P﹣ABCD的高h,使得二面角C﹣AF﹣P的余弦值是 223 .
为响应“低碳生活”的号召,小明每天骑自行车上学.他看到路边的小树向后“飞过”,是以 ____为参照物的.如果他在平直的公路上骑过3km用了10min,则他骑车的速度为 ____ km/h,合 ____ m/s.