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【单选题】
利用SQL语言所建立的视图在数据库中属于( )。A.
B.
虚表
C.
索引
D.
字段
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举一反三
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【简答题】My wife passed away seven and a half years ago, and I went through a huge depression (消沉), the worst time in my life. I even wanted to end my life. I continued to work as a small-town doctor at my med...
【简答题】y=arctanx-x．
【简答题】Christmas at Grandma’s 1 After my father died in 1947, mother went to work to support us. By the time I finished high school, I had been looking forward to spending Christmas with my friends. But two...
【简答题】已知 ，f'(x)=arctanx 2 ，则 =______
【单选题】当温度较高时(如夏天在室外工作的工程机械),宜选择粘度( μ )较高的液压油还是粘度( μ )较低的液压油?
A.
粘度（ μ ）较高的
B.
粘度（ μ ）较低的
C.
二者均可
【简答题】When I was a kid, my dad worked in a shop in the center of our town. Sometimes, I went to the shop with him and I made a little pocket money by buying things for his workmates. But I never paid attent...
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