题目内容

You execute the following command in your Certkiller .com production database to change the width of the CUST_NAME column of the CUSTOMERS table: ALTER TABLE customers MODIFY (cust_nameVARCHAR2 (40)) / When you execute the command, it displays the following error message: ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified What could be the reason for the error message?()

A. The database instance is not available.
B. The ALTER TABLE command does not have WAIT option
C. The table or a row in the table is currently locked by another user session.
D. The database instance is busy processing other user sessions commands.
E. The CUSTOMERS table has no long running query active at the time when this request is made.
F. The server process executing the ALTER TABLE command is busy with another command executio

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企业名称的使用应符合哪些要求?

运行中开启粉仓吸潮管的作用是()

A. 排除粉仓潮气
B. 排出输粉机内的潮气
C. 防止粉仓内的煤粉受潮结块
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案例:某校高一(2)班,学生40人,教学内容:蹲踞式跳远。教学目标:通过课堂教学,学生熟悉蹲踞式跳远的基本规则及动作技术。教学步骤:①上课。教师提问:蹲踞式跳远的要点,蹲踞式跳远分几个技术环节,如何让自己跳得更远?②教师讲解规范姿势的重要性:一是为了维持身体的平衡;二是为落地做积极的准备。③教师示范动作,学生观看并学习。④分组练习蹲踞式跳远。⑤教师巡视指导,纠正错误动作。⑥集合进行集体讲评。⑦小结,布置作业,宣布下课。根据上述材料,该教师是否能完成教学目标?为什么?

车辆类型的选择,主要指对()和()的选择。

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