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單項(xiàng)選擇題

圖形截面對z₁軸的慣性矩I_z1為：（）

A.A
B.B
C.C
D.D

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單項(xiàng)選擇題

圖示截面的抗彎截面模量W_z為：()

A.A
B.B
C.C
D.D

單項(xiàng)選擇題

圖示空心截面對z軸的慣性矩I_z為：（）

A.A
B.B
C.C
D.D