同学们想要证明水的组成,下列实验能达到目的是( )
①水的蒸发②水的蒸馏③电解水④氢气在氧气中燃烧.
A:①②
B:②③
C:②④
D:③④
The Foreign Minister said,“ our hope that the two countries will work towards peace.”
有下列四种微粒:① 818 O、② 1224 Mg、③2311Na、④ 714 N,
用:一边……一边……说一句话。