带通滤光片
红外滤光片(玻璃)
红外塑料滤光片
长/短波通滤光片Two cardinal sins in life
In life and business, there are two cardinal sins.The first is to act precipitously without thought, and the second is to not act at all.
人生及商界中有两类重大错误，第一是不经思索就冒然行动，第二是完全没有行动。
–- 卡尔‧伊坎
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