A:钢铁表面发生吸氧腐蚀时,钢铁表面水膜的pH增大
B:电解精炼铜,开始通电一段时间后,阳极溶解的铜的质量比阴极析出的铜的质量少
C:在镀件上电镀锌,用锌作阳极
D:工作时在原电池的负极和电解池的阴极上都是发生失电子过程
This is Mike's bedroom. It's new and nice. Today Mike's friends, Tom and Lucy are here, too. They are playing video games. Many things are on the bed. It's messy(凌乱的). The coat is Mike's. The T-shirt and the socks are Tom's. There is a red cap. It must be Lucy's.
对下列实验指定容器中的水,其解释没有体现水的主要作用的是( )
A硫在氧气中燃烧 B测定空气中氧气含量 C铁丝在氧气中燃烧 D探究燃烧的条件