[填空题]
The Moon orbits the Earth such that the same side alwaysy r7y:asj 9zm8 fa 2- a+fwia2sf; mkb)ances the Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital ang2af ai2 nfb)k;w-sa m+ular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$