These Severn Valley woods have been exploited for timber since Saxon times.从撒克逊时代起就开始采伐塞文山谷的这些树林获取木料。Half of the north-west's timber land is public property.西北部的一半林地是公共财产。It wants timber to come, where possible, fro...
There are two main kinds of timber trees - softwoods and hardwoods.用材树种有两大类 -- 软木材与硬木材.The timber was snaked to sawmills.这些木材被拖到了锯木厂。Half of the north-west's timber land is public property.西北部的一半林地是公共财产。These Severn...
三氟丙炔和全氟丁烯 -2 在这个区域也出现双重谱带.Duplication of bands in this region is also shown by trifluoropropyne and perfluoro 2 - butene.三氟丙炔和全氟丁炔 -2 在这个区域也出现双重谱带.Duplication of bands in this region is also shown by trifluoropropyne and...