[单选题]图示三根压杆均为细长(大柔度)压杆,且弯曲刚度均为EI。三根压杆的临界荷载Fcr的关系为:

A
Fcra>Fcrb>Fcrc
B
Fcrb>Fcra>Fcrc
C
Fcrc>Fcra>Fcrb
D
Fcrb>Fcrc>Fcra
正确答案:C
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