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液晶监视器的清晰度是由监视器视频通道的带宽和显像管的点距和会聚误差决定的,对于PAL制式而言,其通道带宽与清晰度之间的折算关系为1M78线,对NTSC制式而言,为...more
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不论是上班、上学,还是去食堂打饭,带饭的人越来越多。由于轻便易携带,塑料饭盒受到了很多人的喜爱。然而,塑料制品可能会释放致癌物质,有损健康。相反,常被...more
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