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【单选题】
设空心圆轴的内径为 d ,外径为 D , d/D = α ,则其横截面的极惯性矩 I p 和抗扭截面模量 W t 的表为 .A.
I p =1/64πD 4 (1-α 4 ), W t =1/32πD 3 (1-α 3 ).
B.
I p =1/32πD 4 (1-α 4 ), W t =1/16πD 3 (1-α 3 ).
C.
I p =1/32πD 4 (1-α 4 ), W t =1/16πD 3 (1-α 4 ).
D.
I p =1/32π(D 4 -d 4 ), W t =1/16π(D 3 -d 3 ).
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