发布时间:2025-02-06 11:57:20
外沿高好。根据查询齐家网信息得知,天沟的深度500米,天沟主要用于集中坡屋面雨水至雨水口,天沟外壁比内壁高岀200米,这样可以阻挡从坡屋面流下的雨水至天沟内,有利于防水。
请问各位大虾现在有些不知名的网站开展的有关品牌排名可信度高吗
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