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【判断题】
在一个关系数据库中存在多张二维表,这些二维表的‚主键,不可能相同。A.
正确
B.
错误
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举一反三
【单选题】Transfer form. needs to be signed by your()at your current institution.
A.
international advisor
B.
teacher
C.
department director
D.
classmates
【单选题】The type of current which will have the greatest effect on the course made good for your vessel is ____.
A.
one flowing in the same direction as your course steered
B.
one flowing in the opposite direction as your course steered
C.
one that flows at nearly right angles to your course steered
D.
a rotary current in which the direction of current flow constantly changes
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