门窗按使用材料分类有那些？
参考答案：
木门窗、钢门窗、铝合金门窗、塑钢门窗、玻璃钢门窗、镀锌彩板门窗等。
句型转换
1. You can collect information not only from books but also on the Internet.(同义句转换)
You can collect information ________ from books________ on the Internet.
2. You hear that John is going to Paris next month,
________ ________ ?(反义疑问句)
3. You don't believe that I can work out the problem,
4. He is more important than any other basketball player in the world during the 1990s. (同义句转换)
He is________ ________ important basketball player in the world during the 1990s.
5. He got over troubles and became the greatest basketball player in the world. (同义句转换)
He ________ ________troubles and became the greatestbasketball player in the world.
男性，70岁。超声检查见主动脉瓣增厚、钙化．开放受限，关闭不拢，升主动脉扩张。诊断为主动脉瓣狭窄伴关闭不全，拟行手术治疗。
该患者主动脉瓣手术的最佳方案是（）
A.置换机械瓣
B.置换生物瓣
C.自体肺动脉瓣移植
D.主动脉根部移植
E.主动脉瓣成形
