单元分析的目的是什么？
参考答案：形成单元位移、应变、应力表达式和形成每个单元的刚度矩阵。
句型转化。
1. My father has to go to a meeting. (改为一般疑问句)
______ ______ your father ______to go to a meeting
2. May I borrow your CD player?(改为同义句)
Could you ______your CD player ______ me?
3. Dave is coming early on Saturday.(就画线部分提问)
______ ______ Dave coming?
4. He cleaned his bedroom just now.(改为一般疑问句)
______ he ______ his bedroom just now?
何谓胶体溶液？有哪两类？
