[填空题]
The Moon orbits the Earth su/a1t.f mw26skg cw. alch th pco8vvt q:dd,*0k:k cat the same side always faces the Earth. Determine the ratio of the Moon’s k: odqdvpc,0*:ck vt8 spin angular momentum (about its own axis) to its orbital angular momentum. (In the latter case, treat the Moon as a particle orbiting the Earth.) $\times10^{ -6}$