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【单选题】
《“十三五”旅游业发展规划》“十三五”时期,我国旅游业发展的根本目的是()。A.
旅游经济增长
B.
综合效益提升
C.
人民群众满意
D.
国际影响力提升
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【简答题】阅读理解。 Everyone has got two personalities (性格) -the one that is shown to the world and the other that is secret and real. You don't show your secret personality when you're awake because you can contro...
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【单选题】设有关系 R 和 S ,在下列的关系运算中,( )运算不要求 R 和 S 具有相同的目数,也不要求对应属性的数据类型相同。
A.
R ∪ S
B.
R ∩ S
C.
R-S
D.
R × S
【简答题】任务型阅读.。 Everyone has got two personalities: one is shown to the world and the other is secret and real . You don’t show your secret personality when you are awake , but when you are asleep, your slee...
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【单选题】设有关系 R 和 S ,在下列的关系运算中,( )运算不要求 R 和 S 具有相同的目数,也不要求对应属性的数据类型相同。
A.
R ∪ S
B.
R ∩ S
C.
R-S
D.
R × S
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