内门架起升后不能顺利下降的原因之一为门架与滚轮（）。
A.间隙过大
B.间隙过小
C.间隙变动
D.没有间隙
参考答案：B
什么是弯曲调整值
句型转换。
1. This is a woman (复数).
________________________________________________________
2. May I help you take a picture? (否定回答)
3. She is ten. (就画线提问)
4. I'm going to school. (就画线提问)
5. I'd like to buy many gifts for my family. (同义句)
I'd like to __________ __________ __________ many gifts.
