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【简答题】
如图，在直角坐标系中，点 A 的坐标为（－2，0），连结 OA ，将线段 OA 绕原点 O 顺时针旋转120°，得到线段 OB . （1）求点 B 的坐标； （2）求经过 A、O、B 三点的抛物线的解析式； （3）在（2）中抛物线的对称轴上是否存在点 C ，使△ BOC 的周长最小？若存在，求出点 C 的坐标；若不存在，请说明理由. （4）如果点 P 是（2）中的抛物线上的动点，且在 x 轴的下方，那么△ PAB 是否有最大面积？若有，求出此时 P 点的坐标及△ PAB 的最大面积；若没有，请说明理由.
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【单选题】Which of the following statements about a company's supply chain is true?
A.
A company's supply chain is always internal to a firm.
B.
A company's supply chain is always external to a firm.
C.
A company's supply chain is the same thing as a company's value chain.
D.
Management accountants provide information to enhance a company's supply chain.
【判断题】The author believes that to shut the computer down means it's not using energy.
A.
正确
B.
错误
【简答题】The author believes the Rebekah Books’s deference [A] revealed a cunning personality [B] centered on trivial issues [C] was hardly convincing [D] was part of a conspiracy 本题为单选题，请选出正确答案，谢谢！
【单选题】Which of these statements about Dell's supply chain is best?
A.
Dell's supply chain surplus was largely driven by their negative shipping model.
B.
Dell's initial success was largely driven by the ability to accurately forecast what customers wanted and supply those models to retail outlets that carried their computers.
C.
Dell's initial success was largely driven by their Assembly→Customer supply chain linkage.
D.
Dell's supply chain consists of only two members, Dell and the customer
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