A:①③
B:③②
C:③①
D:①②③
In America, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
①三十五亿
写作:____
②183675221
读作:____
①CH3OH(g)+H2O(g)═CO2(g)+3H2(g)△H=+49.0kJ•mol﹣1
②CH3OH(g)+ 12 O2(g)═CO2(g)+2H2(g)△H=﹣192.9kJ•mol﹣1
下列说法正确的是( )
如果发现散点图中所有的样本点都落在一条斜率为非0实数的直线上,则R2=____