【单选题】丙酸睾酮 药物的鉴别反应是
B.
用醇制氢氧化钾反应,生成沉淀熔点150~156℃
【单选题】破伤风杆菌的形态特征符合下列哪项?( )
【单选题】与酒石酸铜试液反应生成红色沉淀的是()。
【简答题】已知选课关系 SC(S# char(8), C# char(8), GRADE integer) , S# 学号, C# 课程号, GRADE 成绩。检索选修课程 'C2' 的学生中成绩最高的学生的学号。写出 SELECT 语句 。
【单选题】已知选课关系SC(S# char(8), C# char(8), GRADE integer),S#学号,C#课程号,GRADE成绩。检索选修课程'C2'的学生中成绩最高的学生的学号。正确的SELECT语句是()。
A.
SELECT S# FROM SC WHERE C#= 'C2' AND GRADE >=( SELECT GRADE FROM SC WHERE C#= 'C2' )
B.
SELECT S# FROM SC WHERE C#= 'C2' AND GRADE IN ( SELECT GRADE FROM SC WHERE C#= 'C2' )
C.
SELECT S# FROM SC WHERE C#= 'C2' AND GRADE >= ALL ( SELECT GRADE FROM SC WHERE C#= 'C2' )
D.
SELECT S# FROM SC WHERE C#= 'C2' AND GRADE NOT IN ( SELECT GRADE FROM SC WHERE C#= 'C2' )
【简答题】Customer: Where do these vases 1_____ from?What are they 2_____ of? Shop assistant:They come from Jiangxi Province. The vases are made of 3_____ and covered with tiny 4_____ strips. Customer: Are t...
【单选题】炔雌醇 药物的鉴别反应是
B.
用醇制氢氧化钾反应,生成沉淀熔点150~156℃
【单选题】已知选课关系SC(S# char(8), C# char(8), GRADE integer),S#学号,C#课程号,GRADE成绩。检索选修课程'C2'的学生中成绩最高的学生的学号。正确的SELECT语句是( )。
A.
SELECT S# FROM SC WHERE C#='C2' AND GRADE >=MAX(SELECT GRADE FROM SCWHERE C#='C2');
B.
SELECT S# FROM SC WHERE C#='C2' AND GRADE >= ALL(SELECT GRADE FROM SC WHERE C#='C2');
C.
SELECT S# FROM SC WHERE C#='C2' AND GRADE NOT IN(SELECT GRADE FROM SC WHERE C#='C2');
D.
SELECT S# FROM SC WHERE C#='C2' AND GRADE IN (SELECT GRADE FROM SCWHERE C#='C2');