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【单选题】
在R（U）中，如果X→Y，并且对于X的任何一个真子集X’，X’→Y，则（）。A.
Y函数依赖于X
B.
Y对X完全函数依赖
C.
X为U的候选码
D.
R属于2NF
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举一反三
【单选题】Often enough the craft worker's place of employment in ancient Greece was set in rural isolation. Potter, for instance, found it convenient to locate their workshops near their source of clay, regardl...
A.
production techniques
B.
similarity to other crafts
C.
unusual materials
D.
resemblance to earlier pottery
【多选题】商品细节图一般展示的细节特写有()。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
商品的价格
B.
商品的构造
C.
商品的包装
D.
商品的使用功能
【单选题】After she played the piano at school as people applauded.
A.
After she played the piano in school and saw that people applauded.
B.
After she played the piano and people applauded.
C.
After she played the piano in school, people applauded
【单选题】makes the peasant worker proud is he has set up a new bridge for the villagers.A．What; thatB．Wha
A.
35． makes the peasant worker proud is he has set up a new bridge for the villagers. A．What; that
B.
What; because
C.
That; what
D.
That; because
【单选题】A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate what is the minimum number of workers that should be put on the job if at l...
A.
5
B.
8
C.
12
D.
13
E.
30
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