A.5~25 B.5~30 C.10~37 D.5~35
A.15B.20C.25D.50
A.85% B.90% C.95% D.98%
A.放大镜 B.测量显微镜 C.偏光显微镜 D.望远镜
A.14 B.28 C.7 D.3