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【单选题】
在 sql server数据库中，给列名取别名的方式，下面描述错误的是（ ）A.
字段名 as 别名
B.
别名 字段名
C.
字段名 别名
D.
别名 = 字段名表达式
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【简答题】补全对话 —Debbie! S can't believe it! I haven't seen you for years． —Dorothy! It's really a nice surprise! 小题1: —Pretty good． — 小题2: —I wish ! could, but I'm on my way out．I have to be in the city in an h...
【单选题】Dorothy Crowfoot Hodgkin When Dorothy Crowfoot Hodgkin was ten years old, she watched her first crystals form. on a string dangling in a glass of salt water. Many children before and since have done t...
A.
Testing out the structures of penicillin
B.
Testing out the structures of vitamin B12
C.
Determining the arrangement of the atoms in a crystal
D.
Firing x-rays through a crystal
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