[填空题]
What is the linear subg3oc5;-dk6z s*8j9 x8ik. tcy do rcp3gt8 h(oui *jgeed of a point (a) on the equator, $m/s$ (b) on the Arctic Circle (latitude 66.5$^{\circ} $ N), $m/s$ (c) at a latitude of 45.0$^{\circ} $ N, due to the Earth’s rotation? $m/s$