Describes common maintenance tasks that should be performed to keep a database in optimal condition 介绍为保证数据库处于最佳状态而应执行的常规维护任务。
2.
The oil level shall not require constant monitoring and shall be suitable for a minimum of two ( 2 ) years service under specified operating conditions before requiring replacement for normal maintenance 不需要经常观察润滑油容量,在指定的工作环境下,在常规维护要求更换之前,所加的润滑油至少两( 2 )年不需要更换。