变截面杆 AD 受集中力作用,如图所示。设 N AB 、 N BC 、 N CD 分别表示该杆 AB 段, BC 段和 CD 段的轴力,则下列结论中哪些是正确的?答: 。
A.
N AB >N BC >N CD
B.
N AB =N BC =N CD
C.
N AB =N BC >N CD
D.
N AB BC=N CD
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