A:
B:
C:
D:
用CO通过下列方法可以合成甲醇。
①CO2(g)+2H2O(l) === CH3OH(g)+ 32 O2(g) ΔH1=+764.5 kJ·mol-1
②CO(g)+ 12 O2(g)===CO2(g) ΔH2=-283.0 kJ·mol-1
③H2(g)+ 12 O2(g)===H2O(l) ΔH3=-285.8 kJ·mol-1
下列有关说法正确的是( )
星期天,赵明和几个同学约好骑自行车外出游玩,既锻炼身体,又开阔眼界,可他又担心父母反对。下面的几种办法可取的是 ( )
根据句意及首字母提示完成单词。 It's too hot, we need to drink more w____. Mr. Black looks u____ , but he is a really good man. —How is the salad? —Very d____.—Where is the post office? —It's at the c____ of the street. The movie Avatar is great. We d____to see it again.
下列各种食物中,富含蛋白质的是( )