主桅杆顶向下看去，在主桅杆桅楼，你可以看到穿过水手孔，和死眼。
Main mast top Looking down on the main mast top, you can see through the lubber hole, and the dead-eyes.
找出减速顶“死顶”形成的原因及制定应对措施，对调车工作安全具有重要意义。
It has importance to find the cause of "DE AD" retarder formed and make responding measure for the safety of shunting.
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