4和9是请选择DCBA/A2i0{*A:F2y+i(g.,{'a(m9Y8b4z/j,G*R/H
A.质数,{'a(m9Y8b4z/j,G*R/H
B.奇数,{'a(m9Y8b4z/j,G*R/H
C.互质数,{'a(m9Y8b4z/j,G*R/H
D.质因数,{'a(m9Y8b4z/j,G*R/H