[填空题]
The Moon orbits the Earth such that the same side av(/d mdq u(;v)l9djxss 88zan lways faces the Ear6z;vd86nu lotd uw4y7 th. Determine the ratio of the Moon’s spin angular momentum (about its own axis) to its orbital6 tuoyud;78wvdzn6 4 l angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$