由曲线<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/cf3f41a0648a4ff591a3dff166730d85.png?x-oss-process=image/sharpen,200"/>直线<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/36411d2b1ca3428ab574de998113ebff.png?x-oss-process=image/sharpen,200"/>与<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/7149463a7e8b4ea390081739652ea3f7.png?x-oss-process=image/sharpen,200"/>轴围成的平面图形绕<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/d0d8f070c67840af970460995ced90be.png?x-oss-process=image/sharpen,200"/>轴旋转一周所成的旋转体的体积<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/d5b7d7bda3354a719742e048b6d6ca71.png?x-oss-process=image/sharpen,200"/>（）