第四章单元测试
- A fixed coordinate system is non-inertial. True or False? （ ）
- According to the sign convention, mass flowrate out of the control volume is negative and the mass flowrate in is positive. True or False? （ ）
- Write Newton's second law of motion.
- When using Newton's second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （ ）。
- The Bernoulli equation can be written in terms of heights called what? （ ）。
A:错 B:对
答案:错
A:对 B:错
A:that the pressure gradients do not change
B:that the flow will never leave the streamlines
C:All of the above
D:that all of the assumptions are not violated
A:elevations
B:meters
C:levels
D:heads
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