pdf可以直接用cad打开。
具体操作流程如下：
1、打开AutoCAD软件。
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https://iknow-pic.cdn.bcebos.com/738b4710b912c8fcaf528cc0f2039245d688211d"/>
2、执行【插入】—【PDF参考底图】。
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https://iknow-pic.cdn.bcebos.com/86d6277f9e2f070893ff500de724b899a801f2c1"/>
3、出现“选择参考文件”对话框（1号红色框选），见2号框选，选中需要导入的PDF文件，点击2号红色框选中的“确定”。
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https://iknow-pic.cdn.bcebos.com/f703738da977391218c2ff6cf6198618377ae2d3"/>
4、出现“附着PDF参考底图”对话框，我们什么都不用选，直接点击红色框选中的“确定”。
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https://iknow-pic.cdn.bcebos.com/6a600c338744ebf8f4971e32d7f9d72a6159a7dd"/>
5、如下图所示红色框选，看见操作提示，输入坐标，随后点击鼠标左键。
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https://iknow-pic.cdn.bcebos.com/0ff41bd5ad6eddc428ebd1f637dbb6fd526633aa"/>
6、按一下键盘上的“回车”键。
/iknow-pic.cdn.bcebos.com/58ee3d6d55fbb2fb9b0e3d1f414a20a44623dc92"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/58ee3d6d55fbb2fb9b0e3d1f414a20a44623dc92?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="
https://iknow-pic.cdn.bcebos.com/58ee3d6d55fbb2fb9b0e3d1f414a20a44623dc92"/>
7、如下图所示，PDF在CAD中成功打开了。
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https://iknow-pic.cdn.bcebos.com/8cb1cb13495409239e0806739c58d109b3de495d"/>