A：反应后溶液中不存在任何沉淀,所以反应前后的Cu2+浓度不变
B：难溶物溶解得到的溶液中含有深蓝色的配离子Cu(NH3)42+
C：加乙醇后析出的深蓝色晶体是Cu(OH)2
D：在Cu(NH3)42+中,Cu2+给出孤电子对,NH3提供空轨道
在横线上填上合适的单位：树高约10 ____。
There is a store near my home. It is big. It has lots of things in it. You can buy school things like notebooks, pens, pencil cases, rulers and maps. You can also buy drinks, vegetables, fruit and all kinds of food. It doesn't sell clothes. Some of them are cheap. But some of them are expensive.
People in the store are very friendly(友好的). They work from eight in the morning to eight in the evening. They work hard(努力地)all day.
清朝前期，对于开国之初立下战功的八位宗室王公给予了世袭罔替的永久封爵，俗称“铁帽子王”，他们均在京城设王府居住，所有俸禄待遇、王府官员、护卫等全部纳入国家统一管理，由宗人府按规定给予。这一做法（ ）
在血液的组成成分中，具有运输氧气功能的是（ ）
