Trade certification for residential steep roofers is available, but voluntary, in British Columbia.
在不列颠哥伦比亚省，住宅陡峭屋顶工行业认证是可用的，但是自愿的。
Roofers also ranked poorly because of their hazardous working conditions.
屋顶工排名较低的另一个原因是他们危险的工作环境。
Roofers, landscape gardeners and solar-panelinstallers use the virtual maps to scout for potential customers.
盖屋顶的人、庭园美化师和安装太阳能板的人使用虚拟地图搜索潜在的客户。
Roofers also ranked poorly because of their hazardous working conditions. "You obviously can't be afraid of heights, " says Mr.
屋顶工排名较低的另一个原因是他们危险的工作环境。
Roofers also ranked poorly because of their hazardous working conditions. "You obviously can't be afraid of heights, " says Mr.
屋顶工排名较低的另一个原因是他们危险的工作环境。
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