marshaling yard是什么意思 marshaling yard怎么读
marshaling yard的用法和样例
- Under the condition of not changing current hump yard control and driving type and on the basis of the existing gravity retarder, heavy haul car retarder is developed.
摘要在不改变驼峰调车场控制和传动方式的条件下，以现有重力式减速器为基础，研制重载车辆减速器。
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