[填空题]
The Moon orbits the Earth such that the same sioe+ 31 ;e1,tp swkuaaipvp.8/ epab t7de always faces the Earth. Detero4f*wh 9(un v/vfvo.mmine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, trean*vuo/ ff4 hv(vmw .9ot the Moon as a particle orbiting the Earth.) $\times10^{ -6}$