[填空题]
The Moon orbits the Earth such that the sa03cz:ud 8eah usgr );agp2a-b me side always9rm7 21w+orguy1e qx4kwg:bfq:o tx; faces the Earth. Determine the ratio of the Moon’s spin angular momentu :4xyo xfgeqg r7:21umo1 9rb+w;ktwqm (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$