plr是什么意思

用法例句

Engine has been carried out simple and economic processing to refit, added Pre-lubrication equipment The pre-lubncation equipment presses machine oil into en.

对发动机进行简易、经济的加工改装，增设预润滑装置，在发动机起动前将机油压入发动机主油道，使发动机起动时运动部件表面处于流体动力润滑状态，减轻发动机起动时的磨损。