2. 建筑工程
  3. 设D是矩形区域:0≤x≤π/4,-1≤y≤1， A. 0 B.-1/2 C.1/2 D.1/4

设D是矩形区域:0≤x≤π/4,-1≤y≤1， A. 0 B.-1/2 C.1/2 D.1/4

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问题 设D是矩形区域:0≤x≤π/4,-1≤y≤1，
A. 0 B.-1/2 C.1/2 D.1/4
选项
答案D
解析
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