第七章单元测试
- What is most likely to be the main driving force in pipe flow? （ ）。
- What is the appropriate dimensionless parameter to use in comparing flow types?
- The nature of pipe flow is ____. （ ）。
- In the case of fully developed pipe flow, ____. （ ）。
- Steady, fully developed pipe flow experiences no ____. （ ）。
A:Gravity
B:A pressure gradient
C:Force
D:Vacuum
答案:A pressure gradient
A:turbulent
B:random
C:constant
D:strongly dependent on whether the flow is laminar or turbulent
A:the flow is accelerating at a constant rate.
B:the velocity profile is the same at any cross section of the pipe.
C:random
D:the velocity profile is irregular.
A:Acceleration
B:Motion
C:None
D:Friction
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