[填空题]
The Moon orbits the Eara c:f31ic7 wuhfe3iz /th ep + qgeq ;ruk9t27c5nsuch that the same side always faces the Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the t;c 5qke+2nepqrg 7u9latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$