第四章测试1.A fixed coordinate system is non-inertial. True or False? （ ）
A:对 B:错
答案:B
2.According to the sign convention, mass flowrate out of the control volume is negative and the mass flowrate in is positive. True or False? （ ）
A:对 B:错 3.When using Newton's second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （ ）。
A:that the flow will never leave the streamlines B:All of the above C:that the pressure gradients do not change D:that all of the assumptions are not violated 4.The Bernoulli equation can be written in terms of heights called what? （ ）。
A:levels B:meters C:elevations D:heads
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