<div><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1506654636059e455f41ea416492fa00139b7b40c5371.png" alt="上传图片"><br></div><div><p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">评分标准：</span></p>
<p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"">本题有多种答案，只要符合投影原理、三等规则都算对，否则不得分，线型不对酌情扣分。</span></p></div><div><br></div><div><br></div><div><br></div>
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