A.0 B.5 C.10 D.15
A.4000m B.2500m C.1000m D.250m
A.放大倍數(shù)為7倍,物鏡直徑為50mm B.放大倍數(shù)為7倍,物鏡半徑為50mm C.放大倍數(shù)為50倍,物鏡半徑為7mm D.放大倍數(shù)為50倍,物鏡半徑為7mm