[多选] What are three methods to reduce Mysql server exposure to remote connections?（）

公园 Which two statements are true about encrypting RMAN backup?（） (Choose two.) The transparent encryption of backups uses the encryption wallet。 The database uses the same encryption key for every encrypted backup。 The password encryption of backups only uses the password while creating and restoring backup。 If transparent encryption is configured, you cannot use the SET ENCRYPTION BY PASSWORD command to make password-protected backups.。 简述园长的角色。 关节松动术主要用于（）和（）关节活动范围，以利患者完成功能性活动；关节松动技术将操作时手法分为（）级。 三相异步电动机的转差率是转差与（）的比值。 同步转速。 额定转速。 空载转速。 特定转速。 What are three methods to reduce Mysql server exposure to remote connections?（）