<p> <img src="http://s3.qsxt.info/exams/201906/606f44a3-3700-45e5-982a-081db98af18a.png"/>可解得曲线的焦点为<img src="http://s3.qsxt.info/exams/201906/3c35df10-ffc5-4b83-a33f-349d8b861f7e.png"/></p><p> 旋转体的体积<img src="http://s3.qsxt.info/exams/201906/211df849-358d-47f8-8a82-fb02ea6e8e89.png"/></p>
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