单项选择题
A.1.63-3.37[w/(m2•k)]B.1.53-3.27[w/(m2•k)]C.1.42-2.95[w/(m2•k)]D.1-3.72[w/(m2•k)]
A.氢气B.氧气C.氮气D.SO2
A.50B.60C.70D.80