[填空题]
The Moon orbits the Et6 xec3 9oa t.w0c5rd 6j rse (auim*n:*h;doaart.wkk04z:8xpa k)x ud w7 hcj)wh such that the same side 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 latter case, treat the Moon as a particle orbiting thew4p x)xkw hk)u c8wzjk70da:. Earth.) $\times10^{ -6}$