[填空题]
The Moon orbits the Earthj-fh4dmh l g4y7p/ vs7 su uxt.r2k-g yz - .qxrvv:0ikx8ch that the same side always faces the Earth. Determine the ratio of the Moon’s spin angular momegrix-kxzkv xuq0vt . r.y-2 :8ntum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$