Each season has different characteristics, it depends on which season you like! But spring is good, and the Dafeng Elk Cultural Festival is held in spring. Going to see the snow scenery in winter will give you a different feeling. You can also go to see the fallen leaves in autumn. The coastal forest park is great! Go if you're not afraid of the heat in summer, but it's also fun to see the wind farms along the old seawall. They stretch for dozens of miles, and the wind is strong, so the wind turbines will rotate!
A. When studying the rotation of a wind turbine, the huge fan blades of the generator cannot be regarded as particles. Therefore A is wrong.
B. To study the process of a bus decelerating through a zebra crossing, the length of the bus cannot be ignored and cannot be regarded as a particle. Therefore B is wrong.
C. When studying the speed of satellites orbiting the earth, satellites can be regarded as particles. Therefore C is correct.
D. When studying the flight time of a large aircraft from Yancheng Nanyang Airport to Beijing Capital Airport, the size of the large aircraft can be ignored and can be regarded as a particle. Therefore D is correct.
Hence the choice: CD