四轴无人机 带尺寸工程图，包括不限于下面这些内容，记得角落做一些产品概念图
三视图：主视图、俯视图、左视图，用二维表达三维结构
零件图：每个零件单独画，带尺寸、孔位、材料、公差
装配图：说明各零件怎么装在一起
爆炸图 / 爆炸装配图：把零件拆开排布，方便看结构关系
剖视图：把内部结构切开表达
BOM 表：物料清单，写明零件名称、数量、规格
尺寸标注图：把可制造、可复刻需要的关键尺寸写全
Quadcopter drone engineering drawing with dimensions, including but not limited to the following contents, remember to put some product concept drawings in the corners
Three-view drawing: front view, top view, left view, using 2D to express 3D structure
Part drawing: draw each part separately, with dimensions, hole positions, materials, tolerances
Assembly drawing: explain how each part is assembled together
Exploded view / exploded assembly drawing: disassemble and arrange the parts to easily see structural relationships
Cross-sectional view: cut open the internal structure for expression
BOM table: bill of materials, specifying part names, quantities, specifications
Dimensional annotation drawing: fully write out the key dimensions needed for manufacturability and replicability
