阐述了D17A型落下孔车的研制过程、技术参数、结构、性能特点，介绍了该车的试验和运用情况。
The development process, technical parameters, structure and performance features of D17A well car are expounded.
阐述了D17A型落下孔车的研制过程、技术参数、结构、性能特点，介绍了该车的试验和运用情况。
The development process, technical parameters, structure and performance features of D17A well car are expounded.
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