基本上有两种，用外行话说就是青石棉和白石棉。There are basically two types called, in layman's terms, blue and white asbestos.三种最主要的品种是温石棉, 青石棉和铁石棉.The three most important varieties are chrysotile, crocidolite and amosite.强度按青石棉,温石棉, 铁石棉...
I read the letters, none of them very revealing, that is littering his writing table.我读了散放在他书桌子上的一些信, 找不到头绪.No running, no chasing, no littering, no smoking and no eating.场内不准奔跑 、 追逐, 不准乱扔杂物 、 吸烟及饮食任何形式的食物.Last but not t...