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【简答题】
请计算 NaCl 型离子晶体的理论密度。 An AX ceramic compound has the rock salt crystal structure. If the radii of the A and X ions are 0.102 and 0.181 nm , respectively, and the respective atomic weights are 22.99 and 35.45 g/mol. what is the density (in g/cm3) of this material?
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【单选题】Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone agai...
A.
disastrous.
B.
unpredictable.
C.
exciting.
D.
colourful.
【多选题】下面对晶体智力的描述正确的是( )
A.
它不依赖于文化和知识，而取决于个人的禀赋
B.
它在发展到人的中年之后有下降的趋势
C.
在人的一生中是稳步上升的
D.
它取决于后天的学习