根据某款已有发动机曲轴实物画出的cad图形，其中包括该曲轴上的必须的详细尺寸以及标注，对应的A1图纸框架也附带的有，上传方便以大家学习交流-According to a section of the existing engine crankshaft kind cad drawn graphics, including the necessary details on the size of the crankshaft and the mark, the corresponding A1 d