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【单选题】
假设有关系 R(A, B, C) C),其主码为 A ;关系 S(D, A) A),其主码 为 D ,外码为 A 。如下图 示。则关系S 中违反完整性规则的是:A.
<3, 3>
B.
< 1, 2>
C.
<2 ， null>
D.
<4, 1>
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举一反三
【单选题】When driving, we are ________ to fasten the seat belt for safety.
A.
compelling
B.
compelled
C.
to compel
D.
compel
【单选题】According to the passage, which of the following statements is NOT true?
A.
Both Clifford Brown and Max Roach are jazz players.
B.
Chess Records is a musical company.
C.
Dinah Washington had a straightforward personality.
D.
Dinah Washington was a versatile artist.
【简答题】From an early age, we are judged by how we behave under pressure. But is this fair? Not everyone ________ well under pressure. But unfortunately, for these people, many important things in our lives a...
【简答题】Task 2 Complete the following sentences with the proper form of the words or phrases given in brackets. 1 When driving, we are (compel) to fasten the seat belt for safety. 2 (fortunate), she has lost ...
【简答题】We should fasten the ____(safe) belt when you are driving a car.
【单选题】Which is true about sentence (G)?
A.
It uses the passive voice to focus information on city planners.
B.
It uses the passive voice to focus information on public transportation.
【单选题】Which is true about sentence (D)?
A.
It uses passive voice to focus the information on pedestrianization.
B.
It uses active voice to focus the information on business owners.
【简答题】If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors? As we know, scattering (散射) happens when light goes through the...
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