A.5~10倍 B.10~15倍 C.15~20倍 D.20~25倍
A.100~200mm B.200~300mm C.200~400mm D.400~600mm
A.L=Lm+s B.L=Lm+2s C.L=Lm+ΔL D.L=Lm+s+ΔL