【多选题】Which of the following is true about the Tibetans?
A.
The Tibetans are mainly distributed over the Qinghai-Tibet Plateau.
B.
The Tibetans live in houses with flat roofs due to the dry weather and lack of rain.
C.
The Tibetans welcome the guests with a snow-white hada and wish them a "zha-xi-de-le" meaning "good luck".
D.
The Tibetans believe in Tibetan Buddhism.
【单选题】The Tibetans have lived in the Himalayas for centuries and have adjusted to the conditions _________.
B.
at such a great height
D.
on such a great height
【简答题】进入教师账号后,如图片所示的《学习通应用场景》这门课程,显示为其他老师的姓名,则代表主建课教师姓名为()
【简答题】请问退休干部的日常管理由谁负责?按规定移交到街道、社区的,由谁负责?
【简答题】(选做题)已知曲线C 1 的参数方程是 ,以坐标原点为极点,x轴的正半轴为极轴建立坐标系,曲线C 2 的坐标系方程是ρ=2,正方形ABCD的顶点都在C 2 上,且A,B,C,D依逆时针次序排列,点A的极坐标为 。 (1)求点A,B,C,D的直角坐标; (2)设P为C 1 上任意一点,求|PA| 2 +|PB| 2 +|PC| 2 +|PD| 2 的取值范围。