变电站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分prepositions ( 介词）变电站电气主接线是指变电站的变压器、输电线路怎样与电力系统相连接，从而完成输配电任务。变电站的主接线是电力系统接线组成中一个重要组成部分常见介词一. 方位介词1. aboveoveronbelowunderbeneathaboveoverbeneathbelowunderonBe careful, there is a heavy box_ your head.The sun is _ the mountain in the east.There are some stamps_the desk.The position he pointed to was _ the sea level.The little mouse is _ the table, so it is not easy to find it.overabove onabovebelowunder变电站电气主接线是指变电站的变压器、输电线路怎样与电力
