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Fill in the blanks in the following passage with the given words (6 C's). Change the form if necessary. correct complete concrete concise courtesy clear a. Is the body of your letter ________? Have you included all the facts, arguments, examples and details you need to support your point? b. Is your language ________? Is your language free of grammatical and punctuation mistakes? c. Is the body of your letter ______? Have you pared your language down to the essential words you need to express your ideas? d. Is your language ________? Have your gone straight to the point in understandable words? e. Does the body of the letter show ________? Have you chosen expressions to produce goodwill? f. Is your message ________? Have you used specific and definite terms in making an offer or requiring a response?
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【简答题】设有学生-课程关系模型,其关系模式如下: S(SNO,SNAME,,AGE,DEPT); C(CNO,CNAME,TEACHER); SC(SNO,CNO,GRADE); 其中,S表示学生,它的各属性依次为学号、姓名、性别、年龄和所在系;C表示课程,它的各属性依次为课程号、课程名和任课教师;SC表示成绩,它的各属性依次为学号、课程号和分数;其中下划线表示关键字。请完成如下操作: (1) 使用...
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