[填空题]
The Moon orbits the Earth gdb6qp8x -( s. wcou7.9ogf qusx3ewb x.pka-3 uch that the same side always faces the Earth. Determine the ratio of the Moon’s spin angular momentw b3k -x.xp3aeum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$