self-propelled units 中文意思是什麼
self-propelled units
解釋
自航式裝置-
Rolling stock. dimensional characteristics and tolerances for the underframes and body - shells of passanger coaches, vans and self - propelled units
鐵路車輛.客車行李車和自推進裝置的車底架和車身殼體尺寸特性公差
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