盘车检修中要求：小齿轮与大齿轮的齿面接触应大于（）
A.65%
B.70%
C.75%
D.80%
参考答案：B
长方体有______个面，一般的长方体中，最多有______个面是正方形．
句型转换。
1. He knows a little about Chinese. (对划线部分提问)
_____ _____ does he know about Chinese?
2. Jack's mother gives him ten dollars every day. (对划线部分提问)
_____ _____ _____ Jack's mother give him every day?
3. There is an apple in the picture. (对划线部分提问)
How _____ _____ _____ there in the picture?
Chinese?