[多选] Which two statements are true about the Oracle Enterprise Manager （OEM） ？（）

为了能够联接交叉的两根轴，万向联轴器必须成对的使用。 试述教师在游戏的现场指导中如何把握好与儿童的互动节奏？ What are the three steps you should take to tune a JDBC Connection pool in WebLogic from the  initial settings in a production environment?（） Ensure the maximum size is increased to an appropriate setting.。 Set the minimum and maximum size of the connection pool to the same value.。 Increase the statement cache size.。 Add more heap to the JVM.。 Add more nodes to the cluster.。 You are administering a database and you receive a requirement to apply the following restrictions: 1. A connection must be terminated after four unsuccessful login attempts by user. 2. A user should not be able to create more than four simultaneous sessions. 3. User session must be terminated after 15 minutes of inactivity. 4. Users must be prompted to change their passwords every 15 days. How would you accomplish these requirements?（） by granting a secure application role to the users。 by creating and assigning a profile to the users and setting the REMOTE_OS_AUTHENT parameter to false。 By creating and assigning a profile to the users and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameter to 4。 By Implementing Fine-Grained Auditing (FGA) and setting the REMOTE_LOGIN_PASSWORD_FILE parameter to none.。 By implementing the database resource Manager plan and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameters to 4.。 下列（）驱动方式不适合开孔机选用。 人工。 液压。 气压。 太阳能。 Which two statements are true about the Oracle Enterprise Manager （OEM） ？（）