[填空题]
The Moon orbits the Earth sustz rd8+zx +xo5 3 .ym.wcplv6ch that the same side always faces the75qk dwzi ratnl0cr-w :2m.k: Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to irnim7tw ak0wdrc.zl5q -:2 k:ts orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$