设x²+y²≤a∫∫dσ=4π,这里aィ0,则a=() A. 4 B. 2 C. 1 D试题答案_出自学起plus弘成系统兰州财经大学2021春高等数学期末考试

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设x²+y²≤a∫∫dσ=4π,这里aィ0,则a=() A. 4 B. 2 C. 1 D. 0
答案是:A. 4 出自兰州财经大学2021春高等数学期末考试学起plus弘成系统兰州财经大学
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