[填空题]
What is the linear speed ok;)b1*t1q iet(bj) g liz.qxdf a po0gaxwviem6x4 b e 6w,gnn,d+ /int (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? $m/s$