什么叫机械修复法？
参考答案：
利用机械连接，如螺纹连接、键、销、铆钉、过盈连接等，使磨损、断裂、缺损的零件得以修复的方法称为机械修复法。
句型转换，每空一词。
1. Is this a strawberry?(改为复数句)
Are _____ _____?
2. Linda's brother has chicken and tomatoes for dinner.(对画线部分提问)
_____ _____ Linda's brother have for dinner?
3. His mother watches TV every evening.(改为一般疑问句)
_____ his mother _____ TV every evening?
4. His book is in the desk.(对画线部分提问)
_____ _____ his book?
5. Those are his friends.(改为单数句)
_____ _____ his friend.
6. She has a soccer ball.(改为否定句)
She _____ _____ a soccer ball.
7. —Is it an egg?(作肯定回答)
—_____, _____ _____.
8. —Do you like apples?(作否定回答)
9. His ruler is green.(对画线部分提问)
_____ _____ is his ruler?
10. —_____?(根据答句写问句)
—P-E-N．
儿童时期病理性骨折最常见的原因是（）
A.转移性骨病变
B.良性骨囊肿
C.废用性萎缩
D.佝偻病
E.成骨不全
