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在单链表和双向表中，能否从当前结点出发访问到任一结点？

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患者，周某，70岁，50kg体重，血液透析16年余，透析时间4小时，每周二次，低分子肝素首剂3000U，超滤为4KG。威高F16滤器，患者最近诉后背痛，双下肢无力。急查电解质：血钙浓度为1.96mmol/l，血磷浓度为2.3mmol/l，血镁浓度小于0.75mmol/l，钾离子为6.5mmol/l，请问该患者发生了何种情况？如何纠正？

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田园城市

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At the request of a user， you issue the following command to restore a dropped table： flashback table "BIN$F2JFfMq8Q5unbC0ceE9eJg==$0" to before drop； Later， the user notifies you that the data in the table seems to be very old and out of date. What might be the problem？（）

A. Because a proper range of SCNs was not specified， the wrong data was restored.
B. A proper range of timestamps was not specified， so the wrong data was restored.
C. A previous Flashback Drop operation had been performed， resulting in multiple versions of the table being stored in the Recycle Bin.
D. Either option A or B could be correct. Not enough information was provided to determine which.
E. None of the above.

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女，12岁，因眩晕，视物不清3天，惊厥1次入院。近2个月来学习成绩明显下降，3天前出现眩晕和视物不清，惊厥呈癫痫大发作，持续4分钟，发作后嗜睡。体检阳性发现为：左面神经麻痹，有舞蹈样动作，右下肢肌张力减弱，隐约可见面部蝶形红斑，血清ANA阳性。本病最可能出现的后遗症是（）

A. 关节严重畸形
B. 慢性肝硬化
C. 强直性脊柱炎
D. 严重。肾损害
E. 视力障碍

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