A:2SO2(g)+O2(g)2SO3(g)△H<0
B:4NH3(g)+5O2(g)4NO(g)+6H2O(g) △H<0
C:H2(g)+I2(g)2HI(g)△H>0
D:C(s)+H2O(g)CO(g)+H2(g)△H>0
鱼群的其他个体感知后便四散而逃.
我国地域辽阔南北纬度跨度大,下列省区积雪期最长的是( )