17 下圖所示之斷面,對X-X軸之面積慣性矩Ix為何?
(A)64 a4
(B)52 a4
(C)42 a4
(D)36 a
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統計: A(12), B(282), C(25), D(61), E(0) #1217792
統計: A(12), B(282), C(25), D(61), E(0) #1217792