A、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,100kPa) B、(a)H<sub>2sub>O(l,373K,200kPa)与(b)H<sub>2sub>O(g,373K,200kPa) C、(a)H<sub>2sub>O(l,374K,100kPa)与(b)H<sub>2sub>O(g,374K,100kPa) D、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,200kPa)