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【简答题】
什么是实体完整性约束、参照完整性约束和用户定义的完整性约束(域完整性约束)?
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反馈参考答案：
举一反三
【单选题】Water is vital _______every living thing ______, without which the world would be a dead place. [ ]
A.
to keeping; alive
B.
to keep; living
C.
to keeping; lively
D.
to keep; alive
【简答题】A公司经营小肥羊涮肉餐饮服务，于1999年12月14日向国家商标局申请注册“小肥羊”文字商标（第42类餐饮服务），商标局以该商标直接表示服务内容和特点为由驳回注册申请。B公司经营小肥羊烤肉餐饮服务，于2000年10月23日申请注册“小肥羊及图”商标（第42类餐饮服务），商标局审查认为“小肥羊”直接表示了服务内容及特点，要求删去“小肥羊”文字，B公司按要求删除该文字后，获准小肥羊图形商标注册。 经过...
【单选题】A Special Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock＿＿＿＿＿(51) plants when to form. flowers and when the flowers should open. It t...
A.
says
B.
asks
C.
tells
D.
talks
【简答题】函数中的局部变量的值在函数调用结束后不消失而保留原则,即其占用的存储单元不释放,那么这个变量为静态局部变量。用关键字( )进行声明。
【判断题】当希望函数中的局部变量的值在函数调用后不消失,而保留原值,即其占用的存储单元不释放,这时应该指定该局部变量为“静态局部变量”,用关键字static进行声明。
A.
正确
B.
错误
【简答题】Every living thing on this planet is part of ______, for no organism lives entirely on its own.
【单选题】A Biological Clock Every living thing has whatscientists call a biological clock that controls behavior. The biological clock tells__ (51) when to form. flowers and when the flowers should open. It te...
A.
scientists
B.
humans
C.
plants
D.
animals
【单选题】Every living thing has an inner biological clock that controls behavior. The clock works all the time even when there are no outside signs to mark the passing of time. The biological clock tells plant...
A.
the regulation of body temperature
B.
the secretion of hormones
C.
animal reproduction
D.
many aspects of plant and animal physiology
【单选题】A Special Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock(51)plants when to form. flowers and when the flowers should open. It tells i...
A.
says
B.
asks
C.
tells
D.
talks
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【简答题】Every living thing on this planet is part of ______, for no organism lives entirely on its own.
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