确定压杆的承载能力主要由压杆的（）确定。
A.长度
B.截面尺寸
C.形状
D.柔度
参考答案：D
Please do not be ______ by his bad manners since he is merely trying to attract attention.
A．disgusted
B．embarrassed
C．irritated
D．shocked
旁蚀与溯源侵蚀的原因及结果如何？
