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患儿，女，3岁。自幼发现心脏杂音，经常患肺炎，查体胸骨左缘第3～4肋Ⅳ级粗糙收缩期杂音，心电图示左心室及右心房均肥大，X线片示肺血多。 所患疾病可能是
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患儿，女，3岁。自幼发现心脏杂音，经常患肺炎，查体胸骨左缘第3～4肋Ⅳ级粗糙收缩期杂音，心电图示左心室及右心房均肥大，X线片示肺血多。 最常见的并发症
在一个BCNF关系模式中，所有的非主属性对每一个码都是( )。
在学生表STUD中，查询既不是信息系’IS’、数学系’MA’，也不是计算机系’CS’的学生的姓名 (XM)和性别(XB)。SD为系名。实现该功能的正确SQL语句是( )。
We hope that by observing the following points you will enjoy your visit to Christ Church without disturbing the life of the college.* Please obey all notices and do not enter the areas marked Private.* Please do not enter any college rooms.* Please avoid leaving litter (杂物) ; picnicking within the college is not permitted.* Please do not smoke.* Please do not gather so as to obstruct (阻塞) paths or passages, particularly in the Hall.* Please be as quiet as possible, remembering that this is a college where people are working.* In the event of a fire or other danger, or if you hear a fire alarm or warning, please leave the building without delay. At all times please follow the advice of the Custodians (保安人员) who are here to help you.* Closed circuit television surveillance (监视) is in operation. Images are being recorded for purposes of crime prevention and public safety.* Thank you for visiting Christ Church. If you have any comments please write to:The Steward, Christ Church, Oxford OX1 1DP Why is closed circuit television surveillance in operationTo _____________________and ensure public safety.
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