渐变镜从远用区到近用区的镜度变化()。
A、无关紧要
B、决定过渡槽的宽度
C、是固定的
D、呈0.25D递增
参考答案:B
A few years after his graduation from a university, the man acquired the of being a philosopher.
A.reputation
B.influence
C.impression
D.knowledge
生理盲点测定可用于评价哪种维生素的营养状况( )
A.维生素B1
B.维生素B2
C.维生素C
D.维生素A
E.维生素E