[填空题]
The Moon orbits the xbubro2/ - u y7z:b l1y(qey k:qiz23eEart5wj:g(vb 7njf3 z yu9gh such that the same side always faces the Earth. Determine the ratio of :39b(f z5vnw jjg7 uygthe Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$