[填空题]
The Moon orbits the Earth such tgv 6xn1xt0 nlu5i-hh ny8 /b6pho6 3kou8 z3z wb;khws9at the same side always faces the Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its o;b3 os3uwk869zkwzh orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$