The main application fields of silver are:(1)photographic materials;
前言： 综述了银的主要应用领域：（1）感光材料；
Its principle, construction, control circuitry and main application fields are also described briefly.
对其原理、结构、控制电路和主要应用领域作了简要介绍。
Its principle, construction, control circuitry and main application fields are also described briefly.
对其原理、结构、控制电路和主要应用领域作了简要介绍。
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