按拼音写汉字
tiān é
dà xiā
suō yú
____
如图,已知正方体ABCD﹣A1B1C1D1的棱长为2,点E为棱AB的中点.
求:(1)点C到面BC1D的距离;
(2)D1E与平面BC1D所成角的正弦值.
— _____ will your father return home? It's a long time since I saw him last time.
— Just in two days.
——Do you know Shenzhou X is flying in space?—— exciting news!
该图是我国某少数民族的传统节日活动,该民族是