[填空题]
The Moon orbits the Earth suc0ujnd *i5k+ mi7f 2:fndbc4m dh that the same sidzi9-+ 8jl7 wa csh3zutd/vq fvgj -82te always faces the Earth. 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 parti zq v+tgj-a/ift 2wd8-uvj89lzc7 3 hscle orbiting the Earth.) $\times10^{ -6}$