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【简答题】
有机溶剂沉淀法的优点是( )。
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【简答题】根据首字母的提示完成短文， 每空一词。 Some western countries insist that China is one of the world's biggest greenhouse gas emitters (温室气 体排放者). But in f______ (1) our government has taken actions actively to struggle ...
【单选题】假设有scores表的设计如下: ID(编号,主键) StudentID(学生编号) CourseID(课程编号) Score(分数) 现在要查询参加过至少两门课程考试的学生各门课程的平均成绩。以下SQL语句正确的是()。
A.
select StudentID,avg(score) from scores group by StudentID having count(studentID)>1
B.
select StudentID,avg(score) from scores group by StudentID where count(studentID)>1
C.
select StudentID,avg(score) from scores group by StudentID where count(studentID)>1 group by StudentID
D.
select StudentID,avg(score) from scores having count(studentID)>1
【简答题】He is considered to be one of the best romantic poets in China . 译: ______________________________________________________
【单选题】男性,30岁,上腹隐痛一年余,进食后痛,间有黑便,近期发觉面色苍白。检验:Hb 80g/L,RBC 3.2×1012/L,WBC5.0×109/L,plt 150×109/L。考虑患者贫血的最大可能是
A.
巨幼红细胞性贫血
B.
缺铁性贫血
C.
慢性感染性贫血
D.
急性失血性贫血
E.
地中海贫血
【单选题】假设有 scores 表的设计如下：ID（编号，主键）、StudentID （学生编号）、CourseID （课程编号）、Score （分数），现在要查询参加过至少两门课程考试的学生各门课程的平均成绩。以下SQL 语句正确的是
A.
select StudentID，avg(score) from scores group by StudentID having count(studentID)>1
B.
select StudentID，avg(score) from scores group by StudentID where count(studentID)>1
C.
select StudentID，avg(score) from scores group by StudentID where count(studentID)>1 group by StudentID
D.
D.select StudentID，avg(score) from scores having count(studentID)>1
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