A. the rotation of the earth on its axis B. convection currents caused by differences in radiant heating between equatorial and polar regions C. mountain ranges D. All of the above
A. 礼制的破坏 B. 周天子失职 C. 三家对礼制的破坏 D. 周天子对礼制的破坏
A. 停止 B. 减速 C. 加快
A. 30m以上 B. 20m以上 C. 10m以上 D. 50m以上