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【单选题】
若一个关系模式R 中,属性集合U的任何一个真子集的值给定以后都不能完全确定一行,则称该关系模式为(A )。A.
全码
B.
完全函数依赖
C.
主码
D.
候选码
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举一反三
【多选题】What are the two main ways of handling the traffic?
A.
Building new ways
B.
Reducing the number of cars
C.
Using technology
D.
Raising the oil price
【简答题】试用力法求解如图12-25a所示超静定梁，并作出其弯矩图，已知梁的抗弯刚度为EI。
【简答题】试用力法求解如图12-24a所示超静定梁，并作出其弯矩图，已知梁的抗弯刚度为EI。
【单选题】According to the passage, how many ways are there for water to get into the air?
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】(练习1-4) What does the phrases “two ways” refers to in the 6th paragraph?
A.
calling on customer and communication in writing
B.
orally and verbally
C.
by face-to-face contact and by correspondence
D.
by trade delegations and groups
【单选题】What are two ways that we can organize paragraphs according to thispresentation?
A.
introduction, body, and conclusion
B.
block style. and point-by-point style
C.
summative and narrative
D.
point-by-point style. and comparative style
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