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【单选题】
设有关系模式R(X,Y,Z),其中函数依赖集F={(X,Y)→Z,Z→Y},则关系模式R 的规范化程度最高能达到( )。A.
1NF
B.
2NF
C.
3NF
D.
BCNF
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举一反三
【简答题】The young politician ______ the leadership of the party. A) took on B) took over C) took in D) took up
【单选题】当讨论导轮的工作时，技师甲说：导轮改变从涡轮流出的油液方向，使油液返回泵轮；技师乙说：只有部分工作油液从导轮经涡轮流回泵轮。谁正确？（）
A.
甲正确；
B.
乙正确；
C.
两人均正确；
D.
两人均不正确。
【单选题】Why is this customer so frustrated?
A.
The delivery took too much time.
B.
The customer had to pay extra money for the delivery.
C.
The customer service representative was not responsive.
D.
When the delivery arrived, the product was damaged.
【简答题】The boy took a part-time job to _______(delivery) letters and parcels.
【简答题】A.took charge of B.took place of C.took advantage of D.took hold of
【简答题】简述慢性左心衰竭与右心衰竭的临床表现。
【多选题】计算变量X的绝对值并将结果存入变量Y中,下列程序正确的是()
A.
Y=X If Y<0 then X=-Y End If
B.
If X>0 Then Y=X Else Y=-X End If
C.
Y=X If y<0 then Y=-X
D.
X=Y If X<0 Then Y=-X
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