(三)在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的;
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Comparison between the TIN, Knoll’s algorithm, and N-convex dithering using an 8-colour irregular palette. Left to right: TIN, Knoll, N-convex (N=4).
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