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【单选题】
设有描述图书出版情况的关系模式：出版(书号，出版日期，印刷数量 ，设一本书可以被出版多次，每次出版一个印刷数量。该关系模式的主键是( )。A.
书号
B.
(书号，出版日期)
C.
(书号，印刷数量)
D.
(书号，出版日期，印刷数量)
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皮皮学刷刷变学霸
举一反三
【简答题】冠心病的病理基础是A. 动脉粥样硬化
【单选题】The short-term goal of the research is to help a person
A.
whose motor cortex is seriously damaged.
B.
who can operate a wheelchair but not a robotic limb.
C.
who has spinal cord injury but is able to move a wheelchair.
D.
who is unable to move but whose motor cortex is not damaged
【单选题】Arthur Momand used the name ‘Jones’ in his series of short stories because’ Jones’ is ________.
A.
an important name
B.
a popular name in the United States
C.
his neighbour’s name
D.
not a good name
【单选题】What element of a short story might be described as the 'series of related events'?
A.
conflict
B.
character
C.
theme
D.
plot
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