A:①④
B:①②
C:②③
D:③④
关于合理地开发海洋资源,正确的做法是( )
From the ____ (determine) look on her face, I knew she wouldn't change her mind at all.
方法Ⅰ:铜铝混合物 →充分反映足量溶液A 测定生成气体的体积
方法Ⅱ:铜铝混合物 →充分反映足量溶液B 测定剩余固体的质量.