（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；
- Allow transparent backgrounds.
，详情可参考爱思助手下载最新版本
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据悉，本届大会将于 3 月 2 日至 5 日在巴塞罗那举行，vivo 全新旗舰机型 X300 Ultra 也将在展会期间迎来全球首次亮相。