Drawing A Machine Part 机器部分

Complete the following Orthographic Drawing. All visible features should have a “Solid Construction Line”. All elements of a design that can not be seen from a specific angle should have a “Dashed Construction Line”. Use “Reference Lines” like the red lines in the example to help complete the diagram to with correct portions.

完成下列正射图。所有可以看得见的部分都必须用“实线”，而所有看不见的部分都用“虚线”。使用“参照线”，如例中红线，准确完成下图。