问题
单项选择题
Which figure can describe the attribute of the entity in the E-R graph ( )
A．rectangle
B．quadrilateral
C．rhombus
D．ellipse
答案
参考答案：D
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Which figure can describe the attribute of the entity in the E-R graph ( )
A．rectangle
B．quadrilateral
C．rhombus
D．ellipse
参考答案：D