[填空题]
The Moon orbits the Earth such that v1,m7rk; 5kq8buq ql) +tj4,x0zuavxq) ckra the same si.h)(zm 5i +oggytsw .cde always faces the Earth. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital angular momentum. (In the loygtg. +(w ic.zs5hm)atter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$