A.8π/5 B.32π/5 C.16π/5 D.4π/5

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问题 A.8π/5B.32π/5C.16π/5D.4π/5

选项 A.8π/5
B.32π/5
C.16π/5
D.4π/5

答案 B

解析 采用高斯公式得
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