互等定理由变形体的虚功原理得到，只适用于（）。
A.大变形
B.线弹性阶段的小变形
C.大变形和小变形
D.以上都不对
参考答案：B
连词成句。
1. your, Who, is, friend (?)
________________________________
2. name, Her, is, Jenny (.)
.
This city, _____ lies in the northeast, was the country’s busiest port from 1648 to 1950.
A．that
B．which
C．of which
D．where
