旅行社产品的特征有（）
A、服务于物质产品并存
B、质量价格与时间价格并存
C、不可替代性
D、异地性
参考答案：A, B, C, D
用括号内所给单词的适当形式填空
1. The children have a great time_______(play) in the Yu Garden.
2. In the past, it was hard for Chinese farmers to make a______(life).
3. My brother has been_______(collect) stamps since he was five years old.
4. All of us are very_______(interest) in the report about aliens.
5. When did you start_______(practice) playing the piano.
需进行疲劳验算的构件，其纵向受拉钢筋不得采用______接头，也不宜采用______接头。
A．焊接，绑扎搭接 B．机械，绑扎搭接 C．绑扎搭接，焊接 D．机械，焊接
