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【判断题】
Oracle表的唯一键约束与主键约束的一个区别是唯一键标识的表列可以为空。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】'Bridging the gap'(Line 1 ,Para. 4) is used in the passage to refer to ______.
A.
teaching old people more information about the modern technology
B.
asking young generation to get used to the traditional ways of communication
C.
using modern technology to invent easy ways to communicate for old people
D.
neglecting the difference between young and old generations in communication
【简答题】(Para. 1) misdemeanor
【单选题】The word 'confine' (Line 1. Para. 4) most probably means ______.
A.
controlled
B.
defined
C.
restricted
D.
forgiven
【单选题】The expression 'out-of-the-box'(Line 1. Para. 4) most probably means______.
A.
traditional
B.
logical
C.
invariable
D.
inspirational
【简答题】(Para. 2) ___________________________________________________________。
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