A:②④
B:①③④
C:①②③
D:①③
下列装置都可制取氨气,其中药品选用错误的是( )
一个电饭锅285元,一个豆浆机193元,电饭锅比豆浆机便宜多少钱?
— Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.