[填空题]
The Moon orbits the Earth such tyg/,y/r- cv,cd6ae nmhat the same b4ma -e0yht2atv86 rl side always faces the Earth. Determine the ratio of the Moon’s spin arh86 tatyml- 4a0bv2e ngular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$