中 * * 提出,“十二五”时期构建便捷、安全、高效的综合运输体系的原则是( )。
A.安全稳定
B.经济清洁
C.适度超前
D.同步发展
参考答案:C
判断对错,对的画“√”,错的画“×”。
( )1. Sarah: How are you?
Bai Ling: Fine, thank you!
( )2. Li Ping: How old are you?
Wu Yifan: I'm nine.
( )3. John: Thank you !
Mike: You're welcome.
( )4. Chen Jie: May I have a look?
Bai Ling: Look!
( )5. John: What's your name?
Bai Ling: My name is Bai Ling.
( )6. Tom: Let's go to school, OK?
Sarah: Great!
弹性支柱式推力轴承与刚性支柱式推力轴承的主要区别在于()部分。
A.推力瓦;
B.支柱;
C.镜板;
D.底座;