雷诺数是一个无因次数群,无论采用何种单位制,只要数群中各物理量的单位一致,算出的雷诺数相等。
参考答案:对
根据所给答语,选择正确的问句。
1. I'm fine, thank you.[ ]
A. How old are you?
B. Where are you?
C. How are you?
D. What are you?
2. It is seven thirty.[ ]
A. What is it?
B. What colour is it?
C. What day is it?
D. What time is it?
3. I'd like a stamp.[ ]
A. What would you like?
B. What do you like?
C. Do you like the stamp?
D. Would you like a stamp?
4. It's snowy.[ ]
A. Is it snowy?
B. How's the weather?
D. Is it cold
5. I have three books.[ ]
A. What books do you have?
B. How many books do you have?
C. Where are the books?
D. Do you have three books?
在各类信息系统中,哪类系统不涉及全局的、系统性的管理,比如财会管理、生产管理等
A.办公自动化系统
B.管理信息系统
C.决策支持系统
D.事务处理系统