21.若軸以8000 psi之剪應力承受30000 in.lb 的穩定扭矩，試求軸徑約為若干?
(A)1.854 in.
(B)2.914 in.
(C)2.673 in.
(D)3.025 in.

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統計： A(1), B(0), C(2), D(0), E(0) #1651608