(2012)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
出自:基础考试