- If the region has rotational invariance about the origin, we choose polar coordinates to compute the double integral on such a region. （ ）
- Method of cylindrical coordinates involves with polar coordinates on the plane. （ ）
- A surface integral of first type represents the algebraic sum of mass of a finite surface with a suitable density function. （ ）
- On a closed region, the maximum of a function may not be a local maximum. （ ）
答案:对
答案:对
答案:对
答案:对
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答案:对
答案:错
答案:错
答案:对
答案:错
答案:对
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