比例尺 表示成数字式是( )
A:1:1000
B:1:10000
C:1:1000000
D:1:10000000
My father likes jogging the Moon River for half an hour every morning.
①H2S(g)+ 32 O2(g)=SO2(g)+H2O(g) ΔH1
②2H2S(g)+SO2(g)= 32 S2(g)+2H2O(g) ΔH2
③H2S(g)+ 12 O2(g)=S(g)+H2O(g) ΔH3
④2S(g)=S2(g) ΔH4
则ΔH4的正确表达式为( )
世界上海拔最高、线路最长的高原铁路是( )