Know the world constant speed to the past period review

The first phase → know the world's constant speed up to the second phase → know the world's constant speed up to the second phase | 2022 02 phase 3 → know the world's constant speed up to the fourth phase | 2022 03 phase 4 → know the world's constant speed up to the fifth phase of 2022 04 → know the world's constant speed up to the sixth phase of 2022 05 → know the world's constant speed up to the legal hot spot this week: the highest law