明确规定了游戏任务、玩法、规则、结果这四个基本因素的游戏，是下列哪一类游戏？（） 角色游戏。 结构游戏。 创造性游戏。 有规则游戏。
ou are using the flash recovery area （fast recovery area in 11g Release 2） to store backup related files in your database. After regular monitoring of space usage in the Mash recovery area. You realize that the flash recovery area is （jetting filled up very fast and it is running out of space. Your database flash recovery area is low on specie and you have no more room on disk. Proactively， which two options could you use to make more space available in the flash recovery（） Change the RMAN archived log deletion policy.。 Use the RMAN CROSSCHECK command to reclaim the archived log space.。 Change the RMAN retention policy to retain backups for a shorter period of time.。 Use OS command to move files from the flash recovery area to some other location.。
等电位连接：将不同的电气装置、导电物体等，用接地导体或浪涌保护器以某种方式连接起来，以减少雷电流在它们之间产生的（） 电压差。 电流差。 电位差。
脱乙烷塔是（）塔进料状态为（） 填料塔。 浮阀板式。 汇体进料。 分汇混和进料。 气体进料。
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？（） The database instance is not available.。 The ALTER TABLE command does not have WAIT option。 The table or a row in the table is currently locked by another user session.。 The database instance is busy processing other user sessions commands.。 The CUSTOMERS table has no long running query active at the time when this request is made.。 The server process executing the ALTER TABLE command is busy with another command executio。
测定变压器绕组绝缘电阻用（）。
