3,3,6,( ),21,33,48。A.9B.12C.15D.18
3,3,6,( ),21,33,48。
A.9
B.12
C.15
D.18
相关考题:
屋面坡度小于多少时,胎体增强材料平行于屋脊铺设?A.10%B.12%C.15%D.18%
3,3,6,( ),21,33,48。
A.9
B.12
C.15
D.18