如图（a）、（b）、（c），分别求出杆件AC、BC受力大小与性质，并判别哪种结构杆件受力较合理。
参考答案：
图（c）结构的结构杆件受力最合理
解析：
根据句意和首字母提示完成下列句子。
1. There are two c in her family. One is a boy,the other is a girl.
2. If you study h , you will get good grades(成绩).
3. People often go swimming in s .
4. Mr. Black is a reporter. He works for a m .
5. My grandfather loves to tell some interesting s .
具有抗肝炎作用的是
A．小檗碱B．四氢帕马丁C．紫杉醇D．槲皮素E．水飞蓟宾
