[填空题]
The Moon orbits the Earth such that the same side always faces the E:0mvbth-s; wyaro-w9xpslpq9 )c ah zp1wg1 .0rth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a p.9pc)sr 1paoq90 zh gwl1-pw xarticle orbiting the Earth.) $\times10^{ -6}$