（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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。电影是该领域的重要参考
3014350010http://paper.people.com.cn/rmrb/pc/content/202603/05/content_30143500.htmlhttp://paper.people.com.cn/rmrb/pad/content/202603/05/content_30143500.html11921 因地制宜塑强城市优势，这一点在体育直播中也有详细论述
Design-wise, they retain the same iconic rectangular look established by the Headphone (1), but swap some features — a plastic decal replaces the transparent one of the older headphones, with the transparency featuring along the perimeter. The Headphone (1) ditch plastic in their ear cups, offering aluminum CNC components instead, which lends to an overall more premium feel. That said, they are noticeably heavier — 329 grams compared to the Headphone (a) 310 grams. In my experience so far with the cheaper cans, that translated to a slightly more comfortable fit.