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(d) Job rotation. (3 marks)
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贵阳市科杰电脑培训学校 二级 C、二级 VF 培训班承诺考试不合格退培训费 电话:0851-5561184 网址:www（20）设有一组作业，它们的作业提交时刻及估计运行时间如下所示：作业号 提交时刻 估计运行时间（分钟）Job1 8：30 70Job2 9：10 30Job3 9：30 15Job4 9：50 5在单道批处理方式下，采用短作业优先调度算法，作业的执行顺序为;A）Job1，Job4，Job3，Job2B）Job1，Job3，Job4，Job2C）Job4，Job3，Job2，Job1D）Job4，Job1，Job2，Job3
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某单道批处理系统中有四个作业JOB1、JOB2、JOB3和JOB4，它们到达“输入井”的时刻和需要的运行时间如下表假设9：30开始进行作业调度，按照最高响应比作业优先算法，首先被调度的作业是A．JOB1B．JOB2C．JOB3D．JOB4
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设有一组作业，它们提交时刻和估计运行时间如下所示： 作业名 提交时刻 估计运行时间(分钟) Job1 10:00 50 Job2 10:10 30 Job3 10:30 10 Job4 10:50 5 在10:50 时刻开始进行作业调度，调度采用最高响应比优先算法，第一个被选中执行的作业是A．Job1B．Job2C．Job3D．Job4
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Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）A、SELECT SUM(subj1, subj2, subj3) FROM marks;B、SELECT SUM(subj1 + subj2 + subj3) FROM marks;C、SELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;D、SELECT MAX(subj1, subj2, subj3) FROM marks;E、SELECT MINIMUM(subj1) FROM marks;F、SELECT COUNT(std_id) FROM marks WHERE subj1 = AVG(subj1);
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问答题Nowadays more young people can enjoy university education than in the past, but they are faced with another problem: job hunting. Most graduates find it hard to find a satisfactory job, and some have to stay jobless for several years. What do you think may have caused this problem? Write a composition of about 400 words to explain your point of view. The title has been provided for you.Problems in university students' job hunting In the first part of your writing you should present your thesis statement, and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion or a summary. Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a toss of marks.
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单选题Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 AVG(subj1) AND subj2 AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement?（）A
The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.B
The statement returns an error at the SELECT clause.C
The statement returns an error at the WHERE clause.D
The statement returns an error at the ORDER BY clause.
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问答题Task I (10 marks) Write a letter to a company declining a job offer. In the letter, you: ● Express your gratitude to the company for the job offer ● Explain the reason(s) why you have to decline the offer ● Apologise and extend your good wishes to the company Write a letter of between 100 and 120 words in an appropriate style on the answer sheet. Do not write your name or address.
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多选题Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）ASELECT SUM(subj1, subj2, subj3) FROM marks;BSELECT SUM(subj1 + subj2 + subj3) FROM marks;CSELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;DSELECT MAX(subj1, subj2, subj3) FROM marks;ESELECT MINIMUM(subj1) FROM marks;FSELECT COUNT(std_id) FROM marks WHERE subj1 = AVG(subj1);
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