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【简答题】
设X→Y是关系模式R的一个函数依赖,如果不存在X的真子集 使得X→Y 成立,则称Y________X。
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反馈参考答案：
举一反三
【单选题】The higher limit of the intertidal zone is the:
A.
Average high tide.
B.
Highest high tide
C.
Lowest low tide.
D.
Lowest edge of the rocky substrate.
【单选题】关于数控机床的产生说法错误的是:
A.
社会生产发展的产物
B.
目的解决单件、中小批量精密复杂零件的加工问题
C.
数字控制工作母机的概念起源于1950年代美国
D.
1952年研发出世界上第一台NC工作母机
【单选题】The risk of a crash is _________ driving with the legal limit of alcohol in the blood.
A.
the same as
B.
higher than
C.
lower than
【单选题】What evidence do people from the west give to show that a higher speed limit is safe?
A.
The long roads between the cities.
B.
The modern turbo-charged engine.
C.
The economic advantage.
D.
The current policies of Germany and Australia.
【简答题】世界上第一台数控机床是()年()生产的()。
【单选题】What evidence do people from the west give to show that a higher speed limit is safe?
A.
The long roads between the cities.
B.
The modem turbo-charged engine.
C.
The economic advantage.
D.
The current policies of Germany and Australia.
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