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患者，男性，70岁，74kg。13年前行二尖瓣生物瓣置换术。入院前两个月出现过短暂头晕；一前自己突然响亮的心脏杂音同时伴有胸闷、气促、尿少、乏力等症状；查体心尖部Ⅲ级样收缩期杂音。心功能Ⅲ～Ⅳ级。心电图示：心律，Ⅰ度房室传导阻滞。胸部X片示：两肺淤血并间质性肺水肿，右上腔静脉影，肺容积缩小，心脏呈二尖瓣-主动脉型。超声心动图示：二尖瓣生物瓣撕裂反流；肺动脉高压（中度）。拟在全身麻醉下行二尖瓣瓣膜置换术。该患者影像学检查心脏形态改变主要为（）A.
右心房明显扩大
B.
左心房明显扩大
C.
右心室缩小
D.
左心室明显增大
E.
左心室缩小，而右心室增大
F.
左心房增大而左右心室大小无明显改变
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【单选题】检索选修四门以上课程的学生总成绩 (不统计不及格的课程),并要求按总成绩的降序排列出来。
A.
SELECT S#，SUM(GRADE)FROM SC WHERE GRADE＞=60 GROUP BY S# ORDER BY 2 DESC HAVING COUNT(*)＞＝4 WHERE C#=“C2” AND GRADE＞＝ (SELECT GRADE FORM SC WHERE C#=“C2”)
B.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE IN (SELECT GRADE FORM SC WHERE C#=“C2”)
C.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE NOT IN (SELECT GRADE FORM SC WHERE C#=“C2”)
D.
SELECT S# FORM SC WHERE C#=“C2” AND GRADE＞＝ALL (SELECT GRADE FORM SC WHERE C#=“C2”)
【单选题】检索选修四门以上课程的学生总成绩,并要求按总成绩的降序排列出来。正确的SELECT语句是()。
A.
SELECT SNO, SUM (GRADE) FROM SC GROUP BY SNO ORDER BY 2 DESC HAVING COUNT(*) >=
B.
SELECT SNO, SUM (GRADE) FROM SC GROUP BY SNO HAVING COUNT(*)>=4 ORDER BY 2 DESC;
C.
SELECT SNO, SUM (GRADE) FROM SC HAVING COUNT(*)>=4 GROUP BY SNO ORDER BY 2 DESC;
D.
SELECT SNO, SUM (GRADE) FROM SC ORDER BY 2 DESC GROUP BY SNO HAVING COUNT(*)>=4;
【简答题】受理站在接到旅客索赔要求时,应尽快做出赔偿决定,最迟在__天内将处理意见答复旅客。
【单选题】下列关于操作系统的描述不正确的是
A.
单用户系统只允许一个用户独占计算机全部资源
B.
多用户系统允许一个用户独占计算机全部资源
C.
单用户系统同时只能管理一个用户任务
D.
多用户系统能够同时管理多个用户任务
【单选题】检索选修四门以上课程的学生总成绩，并要求按总成绩的降序排列出来。正确的SELECT语句是（）。
A.
SELECT SNO, SUM (GRADE) AS SUM_GRADE FROM SC GROUP BY SNO ORDER BY SUM_GRADE DESC HAVING COUNT(*) >= 4;
B.
SELECT SNO, SUM (GRADE) AS SUM_GRADE FROM SC GROUP BY SNO HAVING COUNT(*)>=4 ORDER BY SUM_GRADE DESC;
C.
SELECT SNO, SUM (GRADE) AS SUM_GRADE FROM SC HAVING COUNT(*)>=4 GROUP BY SNO ORDER BY SUM_GRADE DESC;
D.
SELECT SNO, SUM (GRADE) AS SUM_GRADE FROM SC ORDER BY SUM_GRADE DESC GROUP BY SNO HAVING COUNT(*)>=4;
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