As we all know,in the sewage there contains a great deal of poisonous gas ,such as CO,CO2,methane and sulfureted hydrogen etc.

 
  • 人们都知道,排污管道中含有大量的臭素、二氧化碳、甲烷、硫化氢等有害气体。
今日热词
目录 附录 查词历史