The zeroth law of thermodynamics: The expression of the fundamental experiment fact. The first law of thermodynamics: The a statement of conservation of energy for pure thermodynamic system. The second law of thermodynamics: Why we need the second law of thermodynamics?
Congenital Heart Diseases (CHD)先天性心脏病 General concept CHD occurs in approximately6-8‰ live births In China, alone 250000 children with CHD are b0r€aC1yaT 30% of cases may die within first year of life The etiology remains unsolved Secondary prevention is the strategy at this stage