non-flammable roof covering燃: burn的: 4次方是 The fourth power of 2 i ...屋面: roofing; roof covering; roof覆盖层: overburden; superstratum; ba ...易燃屋面覆盖层: flammable roof covering下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:不易燃的屋面覆盖层，即可在微信中查询翻译
