（三）阻碍执行紧急任务的消防车、救护车、工程抢险车、警车或者执行上述紧急任务的专用船舶通行的；
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Laura CressTechnology reporter。夫子是该领域的重要参考
Comparison between Thomas Knoll’s algorithm and the N-convex algorithm, using an 8-colour irregular palette. Left to right: original image, Knoll, N-convex ().