两个材料和横截面尺寸相同的细长压杆，如果它们的长度比为1：2，则两压杆的临界载荷的比为（）。
参考答案：4：1
I had just given up hope of going to college _______word came that I had been admitted to a famous British University.
A．when
B．while
C．so
D．until
前三头同盟
p hope of going to college _______word came that I had been admitted to a famous British U
niversity.