Firestone's training also extends on the roof where technical representatives provide professional assistance to the roofing crew and conduct installation inspections.
凡士通还可提供屋顶安装培训，其间技术代表可为屋顶安装人员提供专业技术支持并且检查安装情况。
Firestone's training also extends on the roof where technical representatives provide professional assistance to the roofing crew and conduct installation inspections.
凡士通还可提供屋顶安装培训，其间技术代表可为屋顶安装人员提供专业技术支持并且检查安装情况。
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