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【单选题】
医疗用毒性药品、精神药品及戒毒药品处方应保留（）。A.
1年
B.
2年
C.
3年
D.
4年
E.
5年
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【简答题】金晶体的最小重复单元（也称晶胞）是面心立方体，如下图所示，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 表示阿伏加德罗常数，M表示金的摩尔质量。 (1)金晶体的每个晶胞中含有_______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_...
【单选题】There was a _________ in her throat as she gazed at the child who had been separated from her for five years
A.
chunk
B.
piece
C.
lump
D.
block
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A.
it could stand only on its hind legs.
B.
it had only two legs.
C.
it was very attractive.
D.
it had a very big abdomen.
【简答题】金晶体的最小重复单元（也称晶胞）是面心立方体，如图所示即在立方体的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 表示阿伏加德罗常数的值，M表示金的相对原子质量。 (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)一个晶胞的体积是多少？____________ (...
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