ZD6系列电动转辙机偏心套与外齿轮的装配（通过轴承）及偏心套与输入轴的配合，应采用过度配合，不能采用紧配合。（）
参考答案：错
根据句意和所给首字母提示，完成句中所缺的单词。
1. I opened the window to let in the f______ air.
2. He is an old teacher with twenty years' e of teaching.
3. They can p us with enough water and food.
4. Playing with a pet dog can bring us a lot of p .
5. Excuse me. I w______ if you can tell me where to park my car.
6. The moving love story of Liang Shanbo and Zhu Yingtai is an a______ Chinese legend.
正常胸部CT升主动脉与降主动脉横径比约为（）
A.1：1.5
B.1：1
C.1.5：1
D.2：1
E.2.5：1
