顺便提醒大家买房注意查radon, 美国non-smoker 1st reason for lung cancer
myenglishid (2009-07-01 20:48:57) 评论 (1)
4.0 is formally specified as warning line.
But actually, long exposure to radon level at 2.0 can be problematic too.
But actually, long exposure to radon level at 2.0 can be problematic too.
评论 (1)
目前还没有任何评论
myenglishid