A:2SO2 + O2 =2SO3;△H=-196.6kJ·mol-1
B:2H2(g)+O2(g)= 2H2O(l);△H=-571.6kJ·mol-1
C:2H2(g)+O2(g)=2H2O(l);△H=-571.6kJ
D:C(s)+O2(g)=CO2(g);△H=+393.5kJ·mol-1
①青铜器 ②陶器 ③石器 ④铁器
— The match is so exciting. The opposite team is really strong.
— You’re right. But I am sure our team will win!
喜悦 兴奋
①由于是第一次坐飞机,八岁的表弟____得坐立不安。
②因为会有动手创造的____,所以我酷爱上科学课。