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3G手機對PCB行業的挑戰
3G與前兩代的區別是在傳輸聲音和數據的速度上的提升，它能夠處理圖像、音樂、視頻流等多種媒體形式，提供包括網頁瀏覽、電話會議、電子商務等多種信息服務。3G可實現移動性、交互性和分布式三大業務，是“隨時隨地”連接的全球衛星網絡。
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光繪菲林的成份及其操作
要選擇反差系數較大的底片,才能制作出反差較好的工作底片,否則光密度就很難達到,即使你加長顯影時間,使光密度達到要求了,但會隨之給你帶來灰霧加重
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