[单选题]
The acceleration of gravity o/8qez apg xz**4 hdfb rj-jo1.nf, ryyq)nv89bp/g z k *pyuh0 axu,98m+0dvng the Moon is one-sixth what it is on Earth. The radius of the Moon is one-fourth that of the Earth. What is thxu)yp90 by8z q /up g, my9v*h8k0nad ,nrfgv+e Moon's mass compared to the Earth's?
