Besides, how can you breathe the surrounding air?

I mean, we probably all have experience in cleaning toilet bowl or bath tub - I had to cover up my nose/mouth in order not to breathe in the smell - it irritates the respiration system a lot. Hu*****and always coughs whenever he smells such.

所有跟帖： 

• 我认为楼主的"含酸度达90％以上"让我们越解释越歪:) -冬梦- ♀ (146 bytes) () 02/12/2007 postreply 14:16:24

• 用来清除下水道的大多是盐酸,很少用硫酸吧? -王医生- ♂ (0 bytes) () 02/12/2007 postreply 14:51:28

• they are both strong acid to me! -Lvtotravel- ♀ (0 bytes) () 02/12/2007 postreply 17:59:13