A.(a+b)/4 B.(a+b)π/4 C.(a+b)π/2 D.(a+

资格题库2022-08-02  11

问题 A.(a+b)/4B.(a+b)π/4C.(a+b)π/2D.(a+b)/2

选项 A.(a+b)/4
B.(a+b)π/4
C.(a+b)π/2
D.(a+b)/2

答案 C

解析
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