A:①②③
B:②④⑤
C:③④⑤
D:②③④
次氯酸(HClO)具有杀菌消毒的作用,HClO中氯元素的化合价为( )
下列与声现象有关的说法中正确的是( )
To be honest, I'd rather stay at home than go out with him.