设D为曲线与直线所围成的有界平面图形,求D绕x轴旋转一周所得旋转体的体积V.
可解得曲线的焦点为
旋转体的体积
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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