Some people call their residence “草堂” (cao tang) or “草庐” (cao lu) to convey a sense of returning to nature as in _______.
举一反三
- 金属钙在空气中燃烧生成（） A: CaO B: CaO C: CaO及 D: CaO及CaN
- Eugene O’Neill had influenced some Chinese playwrights such as Cao Yu and Hong Sen.
- 在下列CaO、MgO、NaF晶格能中，按从小到大顺序排列的是( )。 A: NaF、MgO、CaO B: MgO、CaO、NaF C: NaF、CaO、MgO D: MgO、NaF、CaO
- NaF、NaCl、MgO、CaO晶格能大小的次序是() A: NaCl﹤NaF﹤MgO﹤CaO B: NaCl﹤NaF﹤CaO﹤MgO C: NaF﹤NaCl﹤MgO﹤CaO D: MgO﹤CaO﹤NaF﹤NaCl
- 水硬度的单位是以CaO为基准物质确定的，硬度为10度说明1L水中含有 （ ） A: 1g CaO B: 0.1g CaO C: 0.01g CaO D: 0.001g CaO