2H2(g)+CO(g)⇌CH3OH(g)△H=﹣90.0kJ•mol﹣1①
2CH3OH(g)⇌CH3OCH3(g)+H2O(g)△H=﹣24.5kJ•mol﹣1②
CO(g)+H2O(g)⇌CO2(g)+H2(g)△H=﹣41.1kJ•mol﹣1③
下列句子,标点符号使用正确的一项是( )
如图,共有____组平行线段.
如图所示,E,D是AB,AC上的两点,BD,CE交于点O,且AB=AC,使△ACE≌△ABD,你补充的条件是____