[填空题]
The Moon orbits the Earth such that the same side always faces the Eco 9dl t5s-s fomr9+2 nk40waharth. Dekpo+ + g3yz* e6yrbxi8x2ru*ntermine the ratio of the Mo6x *ux+ rng 2p8koy*e3+bryzion’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.) $\times10^{ -6}$