A:1个
B:0个或2个
C:3个
D:1个或3个
郑成功收复台湾和清朝设置台湾府的相同作用是( )
小俊用2000元购买了免征利息税的三年期国家建设债券,年利率为3.37%.到期时,小俊可以取回____元.
在以煤为主要原料的合成氨工业中,原料气氢气常用下述方法获得:
①C+H2O(g) CO+H2;
②CO+H2O(g) CO2+H2;
I was ________ excited at that moment ________ I didn't know what to say.