2012年第一天下午真题45? 45. 下列生产的火灾危险性属于甲类的是? A 生产过程中每批使用 甲醇 160L B 加氢反应中每批使用H260m3(标准状态下) C 某药厂质检中心化验室大小16.8×7.2×2.7m,用1L 乙醇 D 生产过程中每批使用200L 丙酮 我选择ACD,B对不对,为什么? 查看更多4个回答 . 4人已关注
请大家帮忙校正一下? 请大家帮忙修改,翻译下面一段话: Hydrogen sulfide is a toxic, colorless gas that is found in almost all of the hydrocarbons handled in a refinery or at a terminal. It has an odor characteristic of rotten eggs that is detectable by odor at levels as low as 3 ppb. H2S deadens the sense of smell at concentrations above about 30 ppm, making smell a poor method of protection. The LC50 concentration (the lethal concentration for 50% of the population) is 713 ppm, a level that can easily be exceeded in the headspace of storage tanks and transportation vessels. Hydrogen sulfide is also heavier than air and will accumulate in low lying areas in a tank farm after being emitted from storage tanks during tank breathing. 硫化氢是一种无色、有毒的气体,存在于几乎所有的炼厂处理的碳氢化合物中或终端产品中。它具有一个臭鸡蛋气味,可检测的臭味检测极限低至 3 ppb 。当 H2S 的浓度在 30 ppm 以上时,会导致失去对气体的嗅觉,其 LC50 浓度(半致死浓度)为 713 ppm ,该浓度在储罐或运输容器的顶部空间很容易被超过。硫化氢比 空气 重,能够在储罐换气时从储罐的散发出后容易在地势低洼的地方积聚。 查看更多4个回答 . 2人已关注