如图,已知∠MON=30°,点A 1 、A 2 、A 3 …在射线ON上,点B 1 、B 2 、B 3 …在射线OM上,△A 1 B 1 A 2 、△A 2 B 2 A 3 、△A 3 B 3 A 4 …均为等边三角形,若OA 1 =1,则△A 5 B 5 A 6 的边长为______,△A 2012 B 2012 A 2013 的边长为______.
【简答题】The earth is a special planet in the solar system. The explosion of the earth produced carbon, nitrogen, vapor and other gases, 小题1: (make) the earth’s atmosphere. What is even more important is _ 小题2...
【简答题】Earth Day is on April 22nd. People say thanks to the Earth and learn ways to keep the Earth safe and clean. But saving the Earth is not just for grow-ups. Kids are also taking an active part in it. Th...