【单选题】关于额外心音的叙述,描述错误的是
A.
是指在第一心音和第二心音之外闻及的病理性附加音
【单选题】___3___, she only studies the day before her English test or ___4___she doesn't feel comfortable to communicate with an English speaker.
【判断题】It is OK to ask one's marital status when you meet a English speaker.
【判断题】You must speak like a native speaker of English when you make an English speech.
【简答题】查询选修2号课程且成绩在90分以上的所有学生。
【判断题】I n spoken English when the speaker wants to show strong emotion, he canput strong stress on the word he wishes to emphasize. Emotional stress impliesthe idea of contrast.
【单选题】设成绩表包含学号、分数等字段。现有查询要求:查询有3门以上课程的成绩在90分以上的学生学号及90分以上课程数。以下SQL语句中正确的是______。
A.
SELECT 学号 , COUNT(*) FROM 成绩 WHERE 分数 >90 GROUP BY 学号 HAVING COUNT(*)>3;
B.
SELECT 学号 , COUNT( 学号 ) FROM 成绩 WHERE 分数 >90 AND COUNT( 学号 )>3;
C.
SELECT 学号 , COUNT(*) FROM 成绩 GROUP BY 学号 HAVING COUNT(*)>3 AND 分数 >90;
D.
SELECT 学号 , COUNT(*) FROM 成绩 WHERE 分数 >90 AND COUNT(*)>3 GROUP BY 学号 ;