—They keep their hands on the phones wherever they go, even while they _______ meals.
A:have
B:are having
C:were having
D:will have
今年,中央电视台拍摄了《远方的家·北纬30°中国行》。北纬30°中国段,西起西藏日喀则地区,东至浙江舟山市,记者自西向东一路走来。
对下列观点或现象的解释,正确的是( )
(Ⅰ)求证:AN∥平面MEC;
(Ⅱ)在线段AM上是否存在点P,使二面角P﹣EC﹣D的大小为 π3 ?若存在,求出AP的长h;若不存在,请说明理由.