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【单选题】
关于压杆失稳，下列说法中正确的是：（ ）A.
给细长压杆任一可能的横向干扰，然后再撤去它，若压杆能够恢复原有的直线形状，此为稳定平衡。
B.
压杆不再保持原有直线状态下的平衡而被压裂，即为压杆的稳定性问题。
C.
压杆稳定性可以由材料、截面面积完全确定
D.
压杆必定先考虑稳定性问题，而后才考虑强度问题
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