题目内容

押运方案中的应急预案主要包括()

A. 车辆事故预案
B. 自然灾害预案
C. 人员调整预案
D. 防盗抢预案
E. 执勤调整预案

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解释OSI模型定义的物理层?

供电安全性是指供电系统()供电的可靠性。

音高的变化也就是指声音的振幅变化。

A. 正确
B. 错误

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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