金晶体的最小重复单元(也称晶胞)是面心立方体,即在立方体的8个顶点各有一个金原子,各个面的中心有一个金原子,每个金原子被相邻的晶胞所共有。金原子的直径为d,用N A 表示加德罗常数,M表示金的摩尔质量。 (1)金晶体每个晶胞中含有________个金原子。 (2)欲计算一个晶胞的体积,除假定金原子是刚性小球外,还应假定____________。 (3)一个晶胞的体积是__________。 (4)金晶体的密度是____________。
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A.
there will inevitably be human cloning in the coming year
B.
the potential to make healthy body tissues is undoubtedly a boon to human beings
C.
it is illegal to clone any kind of creatures in the world
D.
it is legal to clone any kind of creatures in the world except human