问答题 分析轴类零件的加工工艺过程中，如何体现“基准统一”、“基准重合”、“互为基准”、“自为基准”的原则？

未知题型 The connection of loading and unloading refers to the connection of different modes of transportation or means of transportation.

未知题型 Handcart is light, flexible and easy to operate. It is widely used in workshop, warehouse, supermarket, canteen, office, etc.