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【单选题】
某供应商关系模式为： Providler(PID，Pname，Tel，GoodsID，GoodsClas-sID, GoodsName，GoodsPrice) 该关系模式应满足以下函数依赖： PID→Pname，PID→TEL，GoodsID→GoodsClassID，GoodsID→GoodsName，GoodsName→GoodsPrice 则这个关系模式的主码为______。A.
(PID，GoodsName)
B.
(PID，GoodsClassID)
C.
(PID，GoodsI)
D.
(PID，GoodsPric)
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反馈参考答案：
举一反三
【单选题】Trong lòng cua mẹ Tuyết, việc ăn mày là một việc như thế nào?
A.
Mất sĩ diện
B.
đâu có xấu
C.
Ngại quá
D.
Khủng khiếp
【多选题】When we need to make a point on the suce of a solid, on which of the following solid the auxiliary latitude circle method can be used?
A.
Prism
B.
Pyramid
C.
Cylinder
D.
Cone
E.
Sphere
F.
Any revolved solid
【单选题】At which labeled point on the action potential is K+ closest to electrochemical equilibrium?
A.
①
B.
②
C.
③
D.
④
E.
⑤
【单选题】An indifference curve is drawn on a graph with good X on the horizontal axis and good Y on the vertical axis. One point on the curve is X = 5, Y = 5. Which of the following points CANNOT also be on ...
A.
X = 6, Y = 6
B.
X = 6, Y = 4
C.
X = 9, Y = 4
D.
X = 2, Y = 11
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