Which of the following subordinate business structures do not do business on their own and operate only as a foreign contact point where interested parties can obtain information about the parent firm?
【单选题】已知 H 2 (g,298K) +(1/2)O 2 (g,298K)=H 2 O(g,298K) (1) Δ r H (1)=-241.8kJ·mol -1 H 2 (g,298K)=2H(g,298K) (2) Δ r H (2)=436.0kJ·mol -1 O 2 (g,298K)=O(g,298K) (3) Δ r H (3)=247.7kJ·mol -1 根据上述数据可获得H-O 键的平...